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Finding the Fourth Proportional to 656,880.30, 985,320.45 and 420,489.90

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Solution

The fourth proportional to 656,880.30, 985,320.45 and 420,489.90 is: 630,734.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    656,880.30 : 985,320.45 = 420,489.90 : x
  2. Step 2: Convert to fraction form
    656,880.30/985,320.45 = 420,489.90/x
  3. Step 3: Cross multiply
    656,880.30x = 985,320.45 × 420,489.90
  4. Step 4: Simplify right side
    656,880.30x = 414,317,297,488.46
  5. Step 5: Solve for x
    x = 414,317,297,488.46/656,880.30
  6. Step 6: Final answer
    x = 630,734.85

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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.