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Finding the Fourth Proportional to 1,147.85, 1,721.78 and 282.16

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Solution

The fourth proportional to 1,147.85, 1,721.78 and 282.16 is: 423.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.85 : 1,721.78 = 282.16 : x
  2. Step 2: Convert to fraction form
    1,147.85/1,721.78 = 282.16/x
  3. Step 3: Cross multiply
    1,147.85x = 1,721.78 × 282.16
  4. Step 4: Simplify right side
    1,147.85x = 485,819.24
  5. Step 5: Solve for x
    x = 485,819.24/1,147.85
  6. Step 6: Final answer
    x = 423.24

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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.