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Finding the Fourth Proportional to 891.23, 1,331.28 and 660.57

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Solution

The fourth proportional to 891.23, 1,331.28 and 660.57 is: 986.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.23 : 1,331.28 = 660.57 : x
  2. Step 2: Convert to fraction form
    891.23/1,331.28 = 660.57/x
  3. Step 3: Cross multiply
    891.23x = 1,331.28 × 660.57
  4. Step 4: Simplify right side
    891.23x = 879,398.64
  5. Step 5: Solve for x
    x = 879,398.64/891.23
  6. Step 6: Final answer
    x = 986.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.