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Finding the Fourth Proportional to 12,489.68, 18,730.20 and 5,551.76

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Solution

The fourth proportional to 12,489.68, 18,730.20 and 5,551.76 is: 8,325.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.68 : 18,730.20 = 5,551.76 : x
  2. Step 2: Convert to fraction form
    12,489.68/18,730.20 = 5,551.76/x
  3. Step 3: Cross multiply
    12,489.68x = 18,730.20 × 5,551.76
  4. Step 4: Simplify right side
    12,489.68x = 103,985,575.15
  5. Step 5: Solve for x
    x = 103,985,575.15/12,489.68
  6. Step 6: Final answer
    x = 8,325.72

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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.