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Finding the Fourth Proportional to 880.74, 1,215.18 and 531.18

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Solution

The fourth proportional to 880.74, 1,215.18 and 531.18 is: 732.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.74 : 1,215.18 = 531.18 : x
  2. Step 2: Convert to fraction form
    880.74/1,215.18 = 531.18/x
  3. Step 3: Cross multiply
    880.74x = 1,215.18 × 531.18
  4. Step 4: Simplify right side
    880.74x = 645,479.31
  5. Step 5: Solve for x
    x = 645,479.31/880.74
  6. Step 6: Final answer
    x = 732.88

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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.