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Finding the Fourth Proportional to 1,147.72, 1,721.55 and 282.03

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Solution

The fourth proportional to 1,147.72, 1,721.55 and 282.03 is: 423.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.72 : 1,721.55 = 282.03 : x
  2. Step 2: Convert to fraction form
    1,147.72/1,721.55 = 282.03/x
  3. Step 3: Cross multiply
    1,147.72x = 1,721.55 × 282.03
  4. Step 4: Simplify right side
    1,147.72x = 485,528.75
  5. Step 5: Solve for x
    x = 485,528.75/1,147.72
  6. Step 6: Final answer
    x = 423.04

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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.