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Finding the Fourth Proportional to 1,102.70, 1,521.71 and 636.95

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Solution

The fourth proportional to 1,102.70, 1,521.71 and 636.95 is: 878.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.70 : 1,521.71 = 636.95 : x
  2. Step 2: Convert to fraction form
    1,102.70/1,521.71 = 636.95/x
  3. Step 3: Cross multiply
    1,102.70x = 1,521.71 × 636.95
  4. Step 4: Simplify right side
    1,102.70x = 969,242.39
  5. Step 5: Solve for x
    x = 969,242.39/1,102.70
  6. Step 6: Final answer
    x = 878.98

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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.