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Finding the Fourth Proportional to 1,223.01, 1,687.91 and 725.76

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Solution

The fourth proportional to 1,223.01, 1,687.91 and 725.76 is: 1,001.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,223.01 : 1,687.91 = 725.76 : x
  2. Step 2: Convert to fraction form
    1,223.01/1,687.91 = 725.76/x
  3. Step 3: Cross multiply
    1,223.01x = 1,687.91 × 725.76
  4. Step 4: Simplify right side
    1,223.01x = 1,225,013.93
  5. Step 5: Solve for x
    x = 1,225,013.93/1,223.01
  6. Step 6: Final answer
    x = 1,001.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.