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Finding the Fourth Proportional to 656,543.80, 984,815.70 and 420,153.40

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Solution

The fourth proportional to 656,543.80, 984,815.70 and 420,153.40 is: 630,230.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    656,543.80 : 984,815.70 = 420,153.40 : x
  2. Step 2: Convert to fraction form
    656,543.80/984,815.70 = 420,153.40/x
  3. Step 3: Cross multiply
    656,543.80x = 984,815.70 × 420,153.40
  4. Step 4: Simplify right side
    656,543.80x = 413,773,664,728.38
  5. Step 5: Solve for x
    x = 413,773,664,728.38/656,543.80
  6. Step 6: Final answer
    x = 630,230.10

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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.