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Finding the Fourth Proportional to 172,972.61, 259,490.28 and 78,247.41

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Solution

The fourth proportional to 172,972.61, 259,490.28 and 78,247.41 is: 117,385.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    172,972.61 : 259,490.28 = 78,247.41 : x
  2. Step 2: Convert to fraction form
    172,972.61/259,490.28 = 78,247.41/x
  3. Step 3: Cross multiply
    172,972.61x = 259,490.28 × 78,247.41
  4. Step 4: Simplify right side
    172,972.61x = 20,304,441,938.94
  5. Step 5: Solve for x
    x = 20,304,441,938.94/172,972.61
  6. Step 6: Final answer
    x = 117,385.30

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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.