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Finding the Fourth Proportional to 78,699.40, 118,049.10 and 31,985.80

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Solution

The fourth proportional to 78,699.40, 118,049.10 and 31,985.80 is: 47,978.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,699.40 : 118,049.10 = 31,985.80 : x
  2. Step 2: Convert to fraction form
    78,699.40/118,049.10 = 31,985.80/x
  3. Step 3: Cross multiply
    78,699.40x = 118,049.10 × 31,985.80
  4. Step 4: Simplify right side
    78,699.40x = 3,775,894,902.78
  5. Step 5: Solve for x
    x = 3,775,894,902.78/78,699.40
  6. Step 6: Final answer
    x = 47,978.70

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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.