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Finding the Fourth Proportional to 891.33, 1,335.92 and 656.70

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Solution

The fourth proportional to 891.33, 1,335.92 and 656.70 is: 984.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.33 : 1,335.92 = 656.70 : x
  2. Step 2: Convert to fraction form
    891.33/1,335.92 = 656.70/x
  3. Step 3: Cross multiply
    891.33x = 1,335.92 × 656.70
  4. Step 4: Simplify right side
    891.33x = 877,295.38
  5. Step 5: Solve for x
    x = 877,295.38/891.33
  6. Step 6: Final answer
    x = 984.25

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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.