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Finding the Fourth Proportional to 817.93, 1,221.69 and 702.71

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Solution

The fourth proportional to 817.93, 1,221.69 and 702.71 is: 1,049.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.93 : 1,221.69 = 702.71 : x
  2. Step 2: Convert to fraction form
    817.93/1,221.69 = 702.71/x
  3. Step 3: Cross multiply
    817.93x = 1,221.69 × 702.71
  4. Step 4: Simplify right side
    817.93x = 858,484.16
  5. Step 5: Solve for x
    x = 858,484.16/817.93
  6. Step 6: Final answer
    x = 1,049.59

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.