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Finding the Fourth Proportional to 1,102.50, 1,521.51 and 636.78

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Solution

The fourth proportional to 1,102.50, 1,521.51 and 636.78 is: 878.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.50 : 1,521.51 = 636.78 : x
  2. Step 2: Convert to fraction form
    1,102.50/1,521.51 = 636.78/x
  3. Step 3: Cross multiply
    1,102.50x = 1,521.51 × 636.78
  4. Step 4: Simplify right side
    1,102.50x = 968,867.14
  5. Step 5: Solve for x
    x = 968,867.14/1,102.50
  6. Step 6: Final answer
    x = 878.79

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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.