Home / 1,102.20-1,521.06-636.48

Finding the Fourth Proportional to 1,102.20, 1,521.06 and 636.48

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Solution

The fourth proportional to 1,102.20, 1,521.06 and 636.48 is: 878.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,102.20 : 1,521.06 = 636.48 : x
  2. Step 2: Convert to fraction form
    1,102.20/1,521.06 = 636.48/x
  3. Step 3: Cross multiply
    1,102.20x = 1,521.06 × 636.48
  4. Step 4: Simplify right side
    1,102.20x = 968,124.27
  5. Step 5: Solve for x
    x = 968,124.27/1,102.20
  6. Step 6: Final answer
    x = 878.36

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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.