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Finding the Fourth Proportional to 61,091.28, 84,304.80 and 39,830.40

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Solution

The fourth proportional to 61,091.28, 84,304.80 and 39,830.40 is: 54,965.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    61,091.28 : 84,304.80 = 39,830.40 : x
  2. Step 2: Convert to fraction form
    61,091.28/84,304.80 = 39,830.40/x
  3. Step 3: Cross multiply
    61,091.28x = 84,304.80 × 39,830.40
  4. Step 4: Simplify right side
    61,091.28x = 3,357,893,905.92
  5. Step 5: Solve for x
    x = 3,357,893,905.92/61,091.28
  6. Step 6: Final answer
    x = 54,965.19

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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.