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Finding the Fourth Proportional to 78,387.79, 108,108.12 and 52,889.80

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Solution

The fourth proportional to 78,387.79, 108,108.12 and 52,889.80 is: 72,942.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,387.79 : 108,108.12 = 52,889.80 : x
  2. Step 2: Convert to fraction form
    78,387.79/108,108.12 = 52,889.80/x
  3. Step 3: Cross multiply
    78,387.79x = 108,108.12 × 52,889.80
  4. Step 4: Simplify right side
    78,387.79x = 5,717,816,845.18
  5. Step 5: Solve for x
    x = 5,717,816,845.18/78,387.79
  6. Step 6: Final answer
    x = 72,942.70

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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.