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Finding the Fourth Proportional to 28,343.80, 42,515.70 and 7,283.80

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Solution

The fourth proportional to 28,343.80, 42,515.70 and 7,283.80 is: 10,925.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,343.80 : 42,515.70 = 7,283.80 : x
  2. Step 2: Convert to fraction form
    28,343.80/42,515.70 = 7,283.80/x
  3. Step 3: Cross multiply
    28,343.80x = 42,515.70 × 7,283.80
  4. Step 4: Simplify right side
    28,343.80x = 309,675,855.66
  5. Step 5: Solve for x
    x = 309,675,855.66/28,343.80
  6. Step 6: Final answer
    x = 10,925.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.