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Finding the Fourth Proportional to 656,439.80, 984,659.70 and 420,049.40

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Solution

The fourth proportional to 656,439.80, 984,659.70 and 420,049.40 is: 630,074.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    656,439.80 : 984,659.70 = 420,049.40 : x
  2. Step 2: Convert to fraction form
    656,439.80/984,659.70 = 420,049.40/x
  3. Step 3: Cross multiply
    656,439.80x = 984,659.70 × 420,049.40
  4. Step 4: Simplify right side
    656,439.80x = 413,605,716,189.18
  5. Step 5: Solve for x
    x = 413,605,716,189.18/656,439.80
  6. Step 6: Final answer
    x = 630,074.10

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Similar ratio
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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.