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Finding the Fourth Proportional to 1,253.46, 1,729.44 and 811.20

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Solution

The fourth proportional to 1,253.46, 1,729.44 and 811.20 is: 1,119.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,253.46 : 1,729.44 = 811.20 : x
  2. Step 2: Convert to fraction form
    1,253.46/1,729.44 = 811.20/x
  3. Step 3: Cross multiply
    1,253.46x = 1,729.44 × 811.20
  4. Step 4: Simplify right side
    1,253.46x = 1,402,921.73
  5. Step 5: Solve for x
    x = 1,402,921.73/1,253.46
  6. Step 6: Final answer
    x = 1,119.24

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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.