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Finding the Fourth Proportional to 391,024.92, 539,614.46 and 221,255.64

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Solution

The fourth proportional to 391,024.92, 539,614.46 and 221,255.64 is: 305,332.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,024.92 : 539,614.46 = 221,255.64 : x
  2. Step 2: Convert to fraction form
    391,024.92/539,614.46 = 221,255.64/x
  3. Step 3: Cross multiply
    391,024.92x = 539,614.46 × 221,255.64
  4. Step 4: Simplify right side
    391,024.92x = 119,392,742,700.55
  5. Step 5: Solve for x
    x = 119,392,742,700.55/391,024.92
  6. Step 6: Final answer
    x = 305,332.82

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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.