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Finding the Fourth Proportional to 78,339.31, 108,110.46 and 42,531.66

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Solution

The fourth proportional to 78,339.31, 108,110.46 and 42,531.66 is: 58,694.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,339.31 : 108,110.46 = 42,531.66 : x
  2. Step 2: Convert to fraction form
    78,339.31/108,110.46 = 42,531.66/x
  3. Step 3: Cross multiply
    78,339.31x = 108,110.46 × 42,531.66
  4. Step 4: Simplify right side
    78,339.31x = 4,598,117,327.16
  5. Step 5: Solve for x
    x = 4,598,117,327.16/78,339.31
  6. Step 6: Final answer
    x = 58,694.89

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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.