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Finding the Third Proportional to 417.75 and 660.13

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Solution

The third proportional to 417.75 and 660.13 is: 1,043.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    417.75 : 660.13 = 660.13 : x
  2. Step 2: Convert to fraction form
    417.75/660.13 = 660.13/x
  3. Step 3: Cross multiply
    417.75x = 660.13 × 660.13
  4. Step 4: Simplify right side
    417.75x = 435,765.02
  5. Step 5: Solve for x
    x = 435,765.02/417.75
  6. Step 6: Final answer
    x = 1,043.12

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.