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Finding the Fourth Proportional to 955.52, 1,318.72 and 660.16

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Solution

The fourth proportional to 955.52, 1,318.72 and 660.16 is: 911.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.52 : 1,318.72 = 660.16 : x
  2. Step 2: Convert to fraction form
    955.52/1,318.72 = 660.16/x
  3. Step 3: Cross multiply
    955.52x = 1,318.72 × 660.16
  4. Step 4: Simplify right side
    955.52x = 870,566.20
  5. Step 5: Solve for x
    x = 870,566.20/955.52
  6. Step 6: Final answer
    x = 911.09

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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.