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Finding the Fourth Proportional to 148.64, 222.88 and 86.96

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Solution

The fourth proportional to 148.64, 222.88 and 86.96 is: 130.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.64 : 222.88 = 86.96 : x
  2. Step 2: Convert to fraction form
    148.64/222.88 = 86.96/x
  3. Step 3: Cross multiply
    148.64x = 222.88 × 86.96
  4. Step 4: Simplify right side
    148.64x = 19,381.64
  5. Step 5: Solve for x
    x = 19,381.64/148.64
  6. Step 6: Final answer
    x = 130.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.