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Finding the Fourth Proportional to 660.12, 912.10 and 636.76

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Solution

The fourth proportional to 660.12, 912.10 and 636.76 is: 879.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.12 : 912.10 = 636.76 : x
  2. Step 2: Convert to fraction form
    660.12/912.10 = 636.76/x
  3. Step 3: Cross multiply
    660.12x = 912.10 × 636.76
  4. Step 4: Simplify right side
    660.12x = 580,788.80
  5. Step 5: Solve for x
    x = 580,788.80/660.12
  6. Step 6: Final answer
    x = 879.82

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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.