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Finding the Fourth Proportional to 261,635.70, 392,453.55 and 172,989.30

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Solution

The fourth proportional to 261,635.70, 392,453.55 and 172,989.30 is: 259,483.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,635.70 : 392,453.55 = 172,989.30 : x
  2. Step 2: Convert to fraction form
    261,635.70/392,453.55 = 172,989.30/x
  3. Step 3: Cross multiply
    261,635.70x = 392,453.55 × 172,989.30
  4. Step 4: Simplify right side
    261,635.70x = 67,890,264,897.02
  5. Step 5: Solve for x
    x = 67,890,264,897.02/261,635.70
  6. Step 6: Final answer
    x = 259,483.95

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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.