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Finding the Fourth Proportional to 1,432.11, 2,147.15 and 553.88

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Solution

The fourth proportional to 1,432.11, 2,147.15 and 553.88 is: 830.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,432.11 : 2,147.15 = 553.88 : x
  2. Step 2: Convert to fraction form
    1,432.11/2,147.15 = 553.88/x
  3. Step 3: Cross multiply
    1,432.11x = 2,147.15 × 553.88
  4. Step 4: Simplify right side
    1,432.11x = 1,189,249.94
  5. Step 5: Solve for x
    x = 1,189,249.94/1,432.11
  6. Step 6: Final answer
    x = 830.42

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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.