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Finding the Fourth Proportional to 138,766.80, 208,368.90 and 79,717.80

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Solution

The fourth proportional to 138,766.80, 208,368.90 and 79,717.80 is: 119,702.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,766.80 : 208,368.90 = 79,717.80 : x
  2. Step 2: Convert to fraction form
    138,766.80/208,368.90 = 79,717.80/x
  3. Step 3: Cross multiply
    138,766.80x = 208,368.90 × 79,717.80
  4. Step 4: Simplify right side
    138,766.80x = 16,610,710,296.42
  5. Step 5: Solve for x
    x = 16,610,710,296.42/138,766.80
  6. Step 6: Final answer
    x = 119,702.34

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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.