Home / 1,089,172,678.80-1,503,013,899.83-643,280,393.78

Finding the Fourth Proportional to 1,089,172,678.80, 1,503,013,899.83 and 643,280,393.78

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Solution

The fourth proportional to 1,089,172,678.80, 1,503,013,899.83 and 643,280,393.78 is: 887,700,721.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089,172,678.80 : 1,503,013,899.83 = 643,280,393.78 : x
  2. Step 2: Convert to fraction form
    1,089,172,678.80/1,503,013,899.83 = 643,280,393.78/x
  3. Step 3: Cross multiply
    1,089,172,678.80x = 1,503,013,899.83 × 643,280,393.78
  4. Step 4: Simplify right side
    1,089,172,678.80x = 966,859,373,328,724,352
  5. Step 5: Solve for x
    x = 966,859,373,328,724,352/1,089,172,678.80
  6. Step 6: Final answer
    x = 887,700,721.98

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.