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Finding the Fourth Proportional to 78,915.90, 118,377.96 and 39,459.69

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Solution

The fourth proportional to 78,915.90, 118,377.96 and 39,459.69 is: 59,191.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,915.90 : 118,377.96 = 39,459.69 : x
  2. Step 2: Convert to fraction form
    78,915.90/118,377.96 = 39,459.69/x
  3. Step 3: Cross multiply
    78,915.90x = 118,377.96 × 39,459.69
  4. Step 4: Simplify right side
    78,915.90x = 4,671,157,456.46
  5. Step 5: Solve for x
    x = 4,671,157,456.46/78,915.90
  6. Step 6: Final answer
    x = 59,191.59

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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.