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Finding the Fourth Proportional to 716.95, 988.67 and 660.46

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Solution

The fourth proportional to 716.95, 988.67 and 660.46 is: 910.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    716.95 : 988.67 = 660.46 : x
  2. Step 2: Convert to fraction form
    716.95/988.67 = 660.46/x
  3. Step 3: Cross multiply
    716.95x = 988.67 × 660.46
  4. Step 4: Simplify right side
    716.95x = 652,972.04
  5. Step 5: Solve for x
    x = 652,972.04/716.95
  6. Step 6: Final answer
    x = 910.76

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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.