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Finding the Fourth Proportional to 18,691.30, 28,035.13 and 7,005.43

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Solution

The fourth proportional to 18,691.30, 28,035.13 and 7,005.43 is: 10,507.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,691.30 : 28,035.13 = 7,005.43 : x
  2. Step 2: Convert to fraction form
    18,691.30/28,035.13 = 7,005.43/x
  3. Step 3: Cross multiply
    18,691.30x = 28,035.13 × 7,005.43
  4. Step 4: Simplify right side
    18,691.30x = 196,398,140.76
  5. Step 5: Solve for x
    x = 196,398,140.76/18,691.30
  6. Step 6: Final answer
    x = 10,507.46

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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.