Home / 7,821.78-10,790.70-4,988.40

Finding the Fourth Proportional to 7,821.78, 10,790.70 and 4,988.40

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Solution

The fourth proportional to 7,821.78, 10,790.70 and 4,988.40 is: 6,881.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,821.78 : 10,790.70 = 4,988.40 : x
  2. Step 2: Convert to fraction form
    7,821.78/10,790.70 = 4,988.40/x
  3. Step 3: Cross multiply
    7,821.78x = 10,790.70 × 4,988.40
  4. Step 4: Simplify right side
    7,821.78x = 53,828,327.88
  5. Step 5: Solve for x
    x = 53,828,327.88/7,821.78
  6. Step 6: Final answer
    x = 6,881.85

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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.