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Finding the Fourth Proportional to 880.79, 1,215.31 and 531.50

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Solution

The fourth proportional to 880.79, 1,215.31 and 531.50 is: 733.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.79 : 1,215.31 = 531.50 : x
  2. Step 2: Convert to fraction form
    880.79/1,215.31 = 531.50/x
  3. Step 3: Cross multiply
    880.79x = 1,215.31 × 531.50
  4. Step 4: Simplify right side
    880.79x = 645,937.27
  5. Step 5: Solve for x
    x = 645,937.27/880.79
  6. Step 6: Final answer
    x = 733.36

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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.