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Finding the Fourth Proportional to 261,479.65, 392,217.72 and 173,128.54

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Solution

The fourth proportional to 261,479.65, 392,217.72 and 173,128.54 is: 259,691.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,479.65 : 392,217.72 = 173,128.54 : x
  2. Step 2: Convert to fraction form
    261,479.65/392,217.72 = 173,128.54/x
  3. Step 3: Cross multiply
    261,479.65x = 392,217.72 × 173,128.54
  4. Step 4: Simplify right side
    261,479.65x = 67,904,081,225.73
  5. Step 5: Solve for x
    x = 67,904,081,225.73/261,479.65
  6. Step 6: Final answer
    x = 259,691.65

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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.