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Finding the Fourth Proportional to 18,129.47, 27,191.12 and 4,978.76

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Solution

The fourth proportional to 18,129.47, 27,191.12 and 4,978.76 is: 7,467.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,129.47 : 27,191.12 = 4,978.76 : x
  2. Step 2: Convert to fraction form
    18,129.47/27,191.12 = 4,978.76/x
  3. Step 3: Cross multiply
    18,129.47x = 27,191.12 × 4,978.76
  4. Step 4: Simplify right side
    18,129.47x = 135,377,899.76
  5. Step 5: Solve for x
    x = 135,377,899.76/18,129.47
  6. Step 6: Final answer
    x = 7,467.29

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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.