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Finding the Fourth Proportional to 148.36, 221.91 and 87.34

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Solution

The fourth proportional to 148.36, 221.91 and 87.34 is: 130.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    148.36 : 221.91 = 87.34 : x
  2. Step 2: Convert to fraction form
    148.36/221.91 = 87.34/x
  3. Step 3: Cross multiply
    148.36x = 221.91 × 87.34
  4. Step 4: Simplify right side
    148.36x = 19,381.62
  5. Step 5: Solve for x
    x = 19,381.62/148.36
  6. Step 6: Final answer
    x = 130.64

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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.