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Finding the Fourth Proportional to 70,781.79, 106,083.78 and 42,339.72

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Solution

The fourth proportional to 70,781.79, 106,083.78 and 42,339.72 is: 63,456.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,781.79 : 106,083.78 = 42,339.72 : x
  2. Step 2: Convert to fraction form
    70,781.79/106,083.78 = 42,339.72/x
  3. Step 3: Cross multiply
    70,781.79x = 106,083.78 × 42,339.72
  4. Step 4: Simplify right side
    70,781.79x = 4,491,557,541.74
  5. Step 5: Solve for x
    x = 4,491,557,541.74/70,781.79
  6. Step 6: Final answer
    x = 63,456.40

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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.