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Finding the Fourth Proportional to 88.24, 121.75 and 57.15

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Solution

The fourth proportional to 88.24, 121.75 and 57.15 is: 78.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.24 : 121.75 = 57.15 : x
  2. Step 2: Convert to fraction form
    88.24/121.75 = 57.15/x
  3. Step 3: Cross multiply
    88.24x = 121.75 × 57.15
  4. Step 4: Simplify right side
    88.24x = 6,958.01
  5. Step 5: Solve for x
    x = 6,958.01/88.24
  6. Step 6: Final answer
    x = 78.85

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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.