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Finding the Fourth Proportional to 1,500.78, 2,251.17 and 405.14

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Solution

The fourth proportional to 1,500.78, 2,251.17 and 405.14 is: 607.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,500.78 : 2,251.17 = 405.14 : x
  2. Step 2: Convert to fraction form
    1,500.78/2,251.17 = 405.14/x
  3. Step 3: Cross multiply
    1,500.78x = 2,251.17 × 405.14
  4. Step 4: Simplify right side
    1,500.78x = 912,039.01
  5. Step 5: Solve for x
    x = 912,039.01/1,500.78
  6. Step 6: Final answer
    x = 607.71

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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.