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Finding the Fourth Proportional to 18,019.72, 27,005.82 and 10,978.12

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Solution

The fourth proportional to 18,019.72, 27,005.82 and 10,978.12 is: 16,452.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,019.72 : 27,005.82 = 10,978.12 : x
  2. Step 2: Convert to fraction form
    18,019.72/27,005.82 = 10,978.12/x
  3. Step 3: Cross multiply
    18,019.72x = 27,005.82 × 10,978.12
  4. Step 4: Simplify right side
    18,019.72x = 296,473,132.66
  5. Step 5: Solve for x
    x = 296,473,132.66/18,019.72
  6. Step 6: Final answer
    x = 16,452.70

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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.