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Finding the Fourth Proportional to 989.71, 1,366.92 and 674.43

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Solution

The fourth proportional to 989.71, 1,366.92 and 674.43 is: 931.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.71 : 1,366.92 = 674.43 : x
  2. Step 2: Convert to fraction form
    989.71/1,366.92 = 674.43/x
  3. Step 3: Cross multiply
    989.71x = 1,366.92 × 674.43
  4. Step 4: Simplify right side
    989.71x = 921,885.02
  5. Step 5: Solve for x
    x = 921,885.02/989.71
  6. Step 6: Final answer
    x = 931.47

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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.