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Finding the Fourth Proportional to 391,405.70, 587,108.55 and 256,103.30

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Solution

The fourth proportional to 391,405.70, 587,108.55 and 256,103.30 is: 384,154.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,405.70 : 587,108.55 = 256,103.30 : x
  2. Step 2: Convert to fraction form
    391,405.70/587,108.55 = 256,103.30/x
  3. Step 3: Cross multiply
    391,405.70x = 587,108.55 × 256,103.30
  4. Step 4: Simplify right side
    391,405.70x = 150,360,437,113.22
  5. Step 5: Solve for x
    x = 150,360,437,113.22/391,405.70
  6. Step 6: Final answer
    x = 384,154.95

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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.