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Finding the Fourth Proportional to 1,221, 1,687.28 and 925.72

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Solution

The fourth proportional to 1,221, 1,687.28 and 925.72 is: 1,279.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,221 : 1,687.28 = 925.72 : x
  2. Step 2: Convert to fraction form
    1,221/1,687.28 = 925.72/x
  3. Step 3: Cross multiply
    1,221x = 1,687.28 × 925.72
  4. Step 4: Simplify right side
    1,221x = 1,561,948.84
  5. Step 5: Solve for x
    x = 1,561,948.84/1,221
  6. Step 6: Final answer
    x = 1,279.24

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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.