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Finding the Fourth Proportional to 261,158.78, 391,738.30 and 172,391.54

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Solution

The fourth proportional to 261,158.78, 391,738.30 and 172,391.54 is: 258,587.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,158.78 : 391,738.30 = 172,391.54 : x
  2. Step 2: Convert to fraction form
    261,158.78/391,738.30 = 172,391.54/x
  3. Step 3: Cross multiply
    261,158.78x = 391,738.30 × 172,391.54
  4. Step 4: Simplify right side
    261,158.78x = 67,532,366,424.31
  5. Step 5: Solve for x
    x = 67,532,366,424.31/261,158.78
  6. Step 6: Final answer
    x = 258,587.38

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1.5x scale

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.