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Finding the Fourth Proportional to 138.15, 206.96 and 65.93

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Solution

The fourth proportional to 138.15, 206.96 and 65.93 is: 98.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.15 : 206.96 = 65.93 : x
  2. Step 2: Convert to fraction form
    138.15/206.96 = 65.93/x
  3. Step 3: Cross multiply
    138.15x = 206.96 × 65.93
  4. Step 4: Simplify right side
    138.15x = 13,643.51
  5. Step 5: Solve for x
    x = 13,643.51/138.15
  6. Step 6: Final answer
    x = 98.76

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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.