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Finding the Fourth Proportional to 891.52, 1,342.25 and 815.04

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Solution

The fourth proportional to 891.52, 1,342.25 and 815.04 is: 1,227.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.52 : 1,342.25 = 815.04 : x
  2. Step 2: Convert to fraction form
    891.52/1,342.25 = 815.04/x
  3. Step 3: Cross multiply
    891.52x = 1,342.25 × 815.04
  4. Step 4: Simplify right side
    891.52x = 1,093,987.44
  5. Step 5: Solve for x
    x = 1,093,987.44/891.52
  6. Step 6: Final answer
    x = 1,227.10

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.