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Finding the Fourth Proportional to 8,404.70, 12,607.05 and 5,639.90

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Solution

The fourth proportional to 8,404.70, 12,607.05 and 5,639.90 is: 8,459.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,404.70 : 12,607.05 = 5,639.90 : x
  2. Step 2: Convert to fraction form
    8,404.70/12,607.05 = 5,639.90/x
  3. Step 3: Cross multiply
    8,404.70x = 12,607.05 × 5,639.90
  4. Step 4: Simplify right side
    8,404.70x = 71,102,501.30
  5. Step 5: Solve for x
    x = 71,102,501.30/8,404.70
  6. Step 6: Final answer
    x = 8,459.85

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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.