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Finding the Fourth Proportional to 1,080, 1,490.97 and 660.45

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Solution

The fourth proportional to 1,080, 1,490.97 and 660.45 is: 911.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080 : 1,490.97 = 660.45 : x
  2. Step 2: Convert to fraction form
    1,080/1,490.97 = 660.45/x
  3. Step 3: Cross multiply
    1,080x = 1,490.97 × 660.45
  4. Step 4: Simplify right side
    1,080x = 984,711.14
  5. Step 5: Solve for x
    x = 984,711.14/1,080
  6. Step 6: Final answer
    x = 911.77

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.