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Finding the Fourth Proportional to 8,920.62, 12,311.98 and 5,143.10

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Solution

The fourth proportional to 8,920.62, 12,311.98 and 5,143.10 is: 7,098.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,920.62 : 12,311.98 = 5,143.10 : x
  2. Step 2: Convert to fraction form
    8,920.62/12,311.98 = 5,143.10/x
  3. Step 3: Cross multiply
    8,920.62x = 12,311.98 × 5,143.10
  4. Step 4: Simplify right side
    8,920.62x = 63,321,744.34
  5. Step 5: Solve for x
    x = 63,321,744.34/8,920.62
  6. Step 6: Final answer
    x = 7,098.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.