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Finding the Fourth Proportional to 88.08, 121.52 and 55.31

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Solution

The fourth proportional to 88.08, 121.52 and 55.31 is: 76.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.08 : 121.52 = 55.31 : x
  2. Step 2: Convert to fraction form
    88.08/121.52 = 55.31/x
  3. Step 3: Cross multiply
    88.08x = 121.52 × 55.31
  4. Step 4: Simplify right side
    88.08x = 6,720.66
  5. Step 5: Solve for x
    x = 6,720.66/88.08
  6. Step 6: Final answer
    x = 76.31

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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.