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Finding the Fourth Proportional to 656,742.60, 985,113.90 and 420,546.60

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Solution

The fourth proportional to 656,742.60, 985,113.90 and 420,546.60 is: 630,819.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    656,742.60 : 985,113.90 = 420,546.60 : x
  2. Step 2: Convert to fraction form
    656,742.60/985,113.90 = 420,546.60/x
  3. Step 3: Cross multiply
    656,742.60x = 985,113.90 × 420,546.60
  4. Step 4: Simplify right side
    656,742.60x = 414,286,301,257.74
  5. Step 5: Solve for x
    x = 414,286,301,257.74/656,742.60
  6. Step 6: Final answer
    x = 630,819.90

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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.