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Finding the Fourth Proportional to 891.25, 1,335.91 and 371.11

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Solution

The fourth proportional to 891.25, 1,335.91 and 371.11 is: 556.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.25 : 1,335.91 = 371.11 : x
  2. Step 2: Convert to fraction form
    891.25/1,335.91 = 371.11/x
  3. Step 3: Cross multiply
    891.25x = 1,335.91 × 371.11
  4. Step 4: Simplify right side
    891.25x = 495,763.76
  5. Step 5: Solve for x
    x = 495,763.76/891.25
  6. Step 6: Final answer
    x = 556.26

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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.