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Finding the Fourth Proportional to 61,685.92, 85,041.88 and 39,013.60

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Solution

The fourth proportional to 61,685.92, 85,041.88 and 39,013.60 is: 53,785.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,685.92 : 85,041.88 = 39,013.60 : x
  2. Step 2: Convert to fraction form
    61,685.92/85,041.88 = 39,013.60/x
  3. Step 3: Cross multiply
    61,685.92x = 85,041.88 × 39,013.60
  4. Step 4: Simplify right side
    61,685.92x = 3,317,789,889.57
  5. Step 5: Solve for x
    x = 3,317,789,889.57/61,685.92
  6. Step 6: Final answer
    x = 53,785.21

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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.