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Finding the Fourth Proportional to 715.64, 989.15 and 660.29

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Solution

The fourth proportional to 715.64, 989.15 and 660.29 is: 912.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.64 : 989.15 = 660.29 : x
  2. Step 2: Convert to fraction form
    715.64/989.15 = 660.29/x
  3. Step 3: Cross multiply
    715.64x = 989.15 × 660.29
  4. Step 4: Simplify right side
    715.64x = 653,120.39
  5. Step 5: Solve for x
    x = 653,120.39/715.64
  6. Step 6: Final answer
    x = 912.63

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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.