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Finding the Fourth Proportional to 102,715.80, 153,929.70 and 81,691.80

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Solution

The fourth proportional to 102,715.80, 153,929.70 and 81,691.80 is: 122,423.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,715.80 : 153,929.70 = 81,691.80 : x
  2. Step 2: Convert to fraction form
    102,715.80/153,929.70 = 81,691.80/x
  3. Step 3: Cross multiply
    102,715.80x = 153,929.70 × 81,691.80
  4. Step 4: Simplify right side
    102,715.80x = 12,574,794,266.46
  5. Step 5: Solve for x
    x = 12,574,794,266.46/102,715.80
  6. Step 6: Final answer
    x = 122,423.17

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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.