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Finding the Fourth Proportional to 664,655.60, 996,983.40 and 428,459.60

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Solution

The fourth proportional to 664,655.60, 996,983.40 and 428,459.60 is: 642,689.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,655.60 : 996,983.40 = 428,459.60 : x
  2. Step 2: Convert to fraction form
    664,655.60/996,983.40 = 428,459.60/x
  3. Step 3: Cross multiply
    664,655.60x = 996,983.40 × 428,459.60
  4. Step 4: Simplify right side
    664,655.60x = 427,167,108,770.64
  5. Step 5: Solve for x
    x = 427,167,108,770.64/664,655.60
  6. Step 6: Final answer
    x = 642,689.40

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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.