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Finding the Fourth Proportional to 18,918, 28,377.12 and 6,606

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Solution

The fourth proportional to 18,918, 28,377.12 and 6,606 is: 9,909.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918 : 28,377.12 = 6,606 : x
  2. Step 2: Convert to fraction form
    18,918/28,377.12 = 6,606/x
  3. Step 3: Cross multiply
    18,918x = 28,377.12 × 6,606
  4. Step 4: Simplify right side
    18,918x = 187,459,254.72
  5. Step 5: Solve for x
    x = 187,459,254.72/18,918
  6. Step 6: Final answer
    x = 9,909.04

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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.