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Finding the Fourth Proportional to 12,138.79, 18,209.18 and 3,373.71

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Solution

The fourth proportional to 12,138.79, 18,209.18 and 3,373.71 is: 5,060.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.79 : 18,209.18 = 3,373.71 : x
  2. Step 2: Convert to fraction form
    12,138.79/18,209.18 = 3,373.71/x
  3. Step 3: Cross multiply
    12,138.79x = 18,209.18 × 3,373.71
  4. Step 4: Simplify right side
    12,138.79x = 61,432,492.66
  5. Step 5: Solve for x
    x = 61,432,492.66/12,138.79
  6. Step 6: Final answer
    x = 5,060.84

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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.