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Finding the Fourth Proportional to 391,011.70, 587,230.35 and 342,022.90

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Solution

The fourth proportional to 391,011.70, 587,230.35 and 342,022.90 is: 513,657.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,011.70 : 587,230.35 = 342,022.90 : x
  2. Step 2: Convert to fraction form
    391,011.70/587,230.35 = 342,022.90/x
  3. Step 3: Cross multiply
    391,011.70x = 587,230.35 × 342,022.90
  4. Step 4: Simplify right side
    391,011.70x = 200,846,227,275.02
  5. Step 5: Solve for x
    x = 200,846,227,275.02/391,011.70
  6. Step 6: Final answer
    x = 513,657.85

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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.