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Finding the Fourth Proportional to 890.38, 1,332.94 and 660.28

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Solution

The fourth proportional to 890.38, 1,332.94 and 660.28 is: 988.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.38 : 1,332.94 = 660.28 : x
  2. Step 2: Convert to fraction form
    890.38/1,332.94 = 660.28/x
  3. Step 3: Cross multiply
    890.38x = 1,332.94 × 660.28
  4. Step 4: Simplify right side
    890.38x = 880,113.62
  5. Step 5: Solve for x
    x = 880,113.62/890.38
  6. Step 6: Final answer
    x = 988.47

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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.