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Finding the Fourth Proportional to 1,147.18, 1,721.12 and 416.82

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Solution

The fourth proportional to 1,147.18, 1,721.12 and 416.82 is: 625.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.18 : 1,721.12 = 416.82 : x
  2. Step 2: Convert to fraction form
    1,147.18/1,721.12 = 416.82/x
  3. Step 3: Cross multiply
    1,147.18x = 1,721.12 × 416.82
  4. Step 4: Simplify right side
    1,147.18x = 717,397.24
  5. Step 5: Solve for x
    x = 717,397.24/1,147.18
  6. Step 6: Final answer
    x = 625.36

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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.