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Finding the Fourth Proportional to 261,139.01, 391,708.53 and 172,371.78

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Solution

The fourth proportional to 261,139.01, 391,708.53 and 172,371.78 is: 258,557.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,139.01 : 391,708.53 = 172,371.78 : x
  2. Step 2: Convert to fraction form
    261,139.01/391,708.53 = 172,371.78/x
  3. Step 3: Cross multiply
    261,139.01x = 391,708.53 × 172,371.78
  4. Step 4: Simplify right side
    261,139.01x = 67,519,496,557.28
  5. Step 5: Solve for x
    x = 67,519,496,557.28/261,139.01
  6. Step 6: Final answer
    x = 258,557.68

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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.