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Finding the Fourth Proportional to 62,643.56, 86,428.90 and 38,761.80

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Solution

The fourth proportional to 62,643.56, 86,428.90 and 38,761.80 is: 53,479.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    62,643.56 : 86,428.90 = 38,761.80 : x
  2. Step 2: Convert to fraction form
    62,643.56/86,428.90 = 38,761.80/x
  3. Step 3: Cross multiply
    62,643.56x = 86,428.90 × 38,761.80
  4. Step 4: Simplify right side
    62,643.56x = 3,350,139,736.02
  5. Step 5: Solve for x
    x = 3,350,139,736.02/62,643.56
  6. Step 6: Final answer
    x = 53,479.40

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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.