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Finding the Fourth Proportional to 78,838.89, 118,090.20 and 63,781.40

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Solution

The fourth proportional to 78,838.89, 118,090.20 and 63,781.40 is: 95,536.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,838.89 : 118,090.20 = 63,781.40 : x
  2. Step 2: Convert to fraction form
    78,838.89/118,090.20 = 63,781.40/x
  3. Step 3: Cross multiply
    78,838.89x = 118,090.20 × 63,781.40
  4. Step 4: Simplify right side
    78,838.89x = 7,531,957,691.83
  5. Step 5: Solve for x
    x = 7,531,957,691.83/78,838.89
  6. Step 6: Final answer
    x = 95,536.07

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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.