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Finding the Fourth Proportional to 42,603.60, 63,905.40 and 39,687.60

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Solution

The fourth proportional to 42,603.60, 63,905.40 and 39,687.60 is: 59,531.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,603.60 : 63,905.40 = 39,687.60 : x
  2. Step 2: Convert to fraction form
    42,603.60/63,905.40 = 39,687.60/x
  3. Step 3: Cross multiply
    42,603.60x = 63,905.40 × 39,687.60
  4. Step 4: Simplify right side
    42,603.60x = 2,536,251,953.04
  5. Step 5: Solve for x
    x = 2,536,251,953.04/42,603.60
  6. Step 6: Final answer
    x = 59,531.40

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.