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Finding the Fourth Proportional to 138.42, 207.45 and 65.25

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Solution

The fourth proportional to 138.42, 207.45 and 65.25 is: 97.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.42 : 207.45 = 65.25 : x
  2. Step 2: Convert to fraction form
    138.42/207.45 = 65.25/x
  3. Step 3: Cross multiply
    138.42x = 207.45 × 65.25
  4. Step 4: Simplify right side
    138.42x = 13,536.11
  5. Step 5: Solve for x
    x = 13,536.11/138.42
  6. Step 6: Final answer
    x = 97.79

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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.