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Finding the Fourth Proportional to 656,410.80, 984,616.20 and 420,020.40

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Solution

The fourth proportional to 656,410.80, 984,616.20 and 420,020.40 is: 630,030.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    656,410.80 : 984,616.20 = 420,020.40 : x
  2. Step 2: Convert to fraction form
    656,410.80/984,616.20 = 420,020.40/x
  3. Step 3: Cross multiply
    656,410.80x = 984,616.20 × 420,020.40
  4. Step 4: Simplify right side
    656,410.80x = 413,558,890,170.48
  5. Step 5: Solve for x
    x = 413,558,890,170.48/656,410.80
  6. Step 6: Final answer
    x = 630,030.60

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Double scale
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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.