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Finding the Fourth Proportional to 13,439.64, 18,549 and 8,658.24

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Solution

The fourth proportional to 13,439.64, 18,549 and 8,658.24 is: 11,949.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,439.64 : 18,549 = 8,658.24 : x
  2. Step 2: Convert to fraction form
    13,439.64/18,549 = 8,658.24/x
  3. Step 3: Cross multiply
    13,439.64x = 18,549 × 8,658.24
  4. Step 4: Simplify right side
    13,439.64x = 160,601,693.76
  5. Step 5: Solve for x
    x = 160,601,693.76/13,439.64
  6. Step 6: Final answer
    x = 11,949.85

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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.