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Finding the Fourth Proportional to 1,147.73, 1,721.95 and 686.03

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Solution

The fourth proportional to 1,147.73, 1,721.95 and 686.03 is: 1,029.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.73 : 1,721.95 = 686.03 : x
  2. Step 2: Convert to fraction form
    1,147.73/1,721.95 = 686.03/x
  3. Step 3: Cross multiply
    1,147.73x = 1,721.95 × 686.03
  4. Step 4: Simplify right side
    1,147.73x = 1,181,299.03
  5. Step 5: Solve for x
    x = 1,181,299.03/1,147.73
  6. Step 6: Final answer
    x = 1,029.25

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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.