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Finding the Fourth Proportional to 8,459.70, 12,689.55 and 2,912.55

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Solution

The fourth proportional to 8,459.70, 12,689.55 and 2,912.55 is: 4,368.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,459.70 : 12,689.55 = 2,912.55 : x
  2. Step 2: Convert to fraction form
    8,459.70/12,689.55 = 2,912.55/x
  3. Step 3: Cross multiply
    8,459.70x = 12,689.55 × 2,912.55
  4. Step 4: Simplify right side
    8,459.70x = 36,958,948.85
  5. Step 5: Solve for x
    x = 36,958,948.85/8,459.70
  6. Step 6: Final answer
    x = 4,368.83

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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.