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Finding the Fourth Proportional to 660,385.20, 991,614.60 and 380,449.20

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Solution

The fourth proportional to 660,385.20, 991,614.60 and 380,449.20 is: 571,271.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,385.20 : 991,614.60 = 380,449.20 : x
  2. Step 2: Convert to fraction form
    660,385.20/991,614.60 = 380,449.20/x
  3. Step 3: Cross multiply
    660,385.20x = 991,614.60 × 380,449.20
  4. Step 4: Simplify right side
    660,385.20x = 377,258,981,278.32
  5. Step 5: Solve for x
    x = 377,258,981,278.32/660,385.20
  6. Step 6: Final answer
    x = 571,271.10

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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.