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Finding the Fourth Proportional to 61,871.68, 85,340.64 and 39,505.60

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Solution

The fourth proportional to 61,871.68, 85,340.64 and 39,505.60 is: 54,490.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,871.68 : 85,340.64 = 39,505.60 : x
  2. Step 2: Convert to fraction form
    61,871.68/85,340.64 = 39,505.60/x
  3. Step 3: Cross multiply
    61,871.68x = 85,340.64 × 39,505.60
  4. Step 4: Simplify right side
    61,871.68x = 3,371,433,187.58
  5. Step 5: Solve for x
    x = 3,371,433,187.58/61,871.68
  6. Step 6: Final answer
    x = 54,490.73

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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.