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Finding the Fourth Proportional to 88.08, 121.36 and 68.64

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Solution

The fourth proportional to 88.08, 121.36 and 68.64 is: 94.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.08 : 121.36 = 68.64 : x
  2. Step 2: Convert to fraction form
    88.08/121.36 = 68.64/x
  3. Step 3: Cross multiply
    88.08x = 121.36 × 68.64
  4. Step 4: Simplify right side
    88.08x = 8,330.15
  5. Step 5: Solve for x
    x = 8,330.15/88.08
  6. Step 6: Final answer
    x = 94.57

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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.