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Finding the Fourth Proportional to 71,509.92, 98,684.37 and 39,681.78

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Solution

The fourth proportional to 71,509.92, 98,684.37 and 39,681.78 is: 54,761.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,509.92 : 98,684.37 = 39,681.78 : x
  2. Step 2: Convert to fraction form
    71,509.92/98,684.37 = 39,681.78/x
  3. Step 3: Cross multiply
    71,509.92x = 98,684.37 × 39,681.78
  4. Step 4: Simplify right side
    71,509.92x = 3,915,971,459.78
  5. Step 5: Solve for x
    x = 3,915,971,459.78/71,509.92
  6. Step 6: Final answer
    x = 54,761.23

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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.