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Finding the Fourth Proportional to 283,691.12, 391,488.90 and 156,378.56

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Solution

The fourth proportional to 283,691.12, 391,488.90 and 156,378.56 is: 215,799.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    283,691.12 : 391,488.90 = 156,378.56 : x
  2. Step 2: Convert to fraction form
    283,691.12/391,488.90 = 156,378.56/x
  3. Step 3: Cross multiply
    283,691.12x = 391,488.90 × 156,378.56
  4. Step 4: Simplify right side
    283,691.12x = 61,220,470,437.98
  5. Step 5: Solve for x
    x = 61,220,470,437.98/283,691.12
  6. Step 6: Final answer
    x = 215,799.74

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.