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Finding the Fourth Proportional to 738.91, 1,020.14 and 689.95

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Solution

The fourth proportional to 738.91, 1,020.14 and 689.95 is: 952.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    738.91 : 1,020.14 = 689.95 : x
  2. Step 2: Convert to fraction form
    738.91/1,020.14 = 689.95/x
  3. Step 3: Cross multiply
    738.91x = 1,020.14 × 689.95
  4. Step 4: Simplify right side
    738.91x = 703,845.59
  5. Step 5: Solve for x
    x = 703,845.59/738.91
  6. Step 6: Final answer
    x = 952.55

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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.