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Finding the Fourth Proportional to 78,701.80, 118,070.52 and 28,781.68

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Solution

The fourth proportional to 78,701.80, 118,070.52 and 28,781.68 is: 43,179.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,701.80 : 118,070.52 = 28,781.68 : x
  2. Step 2: Convert to fraction form
    78,701.80/118,070.52 = 28,781.68/x
  3. Step 3: Cross multiply
    78,701.80x = 118,070.52 × 28,781.68
  4. Step 4: Simplify right side
    78,701.80x = 3,398,267,924.07
  5. Step 5: Solve for x
    x = 3,398,267,924.07/78,701.80
  6. Step 6: Final answer
    x = 43,179.04

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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.