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Finding the Fourth Proportional to 880.53, 1,321.25 and 387.29

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Solution

The fourth proportional to 880.53, 1,321.25 and 387.29 is: 581.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.53 : 1,321.25 = 387.29 : x
  2. Step 2: Convert to fraction form
    880.53/1,321.25 = 387.29/x
  3. Step 3: Cross multiply
    880.53x = 1,321.25 × 387.29
  4. Step 4: Simplify right side
    880.53x = 511,701.27
  5. Step 5: Solve for x
    x = 511,701.27/880.53
  6. Step 6: Final answer
    x = 581.13

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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.