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Finding the Fourth Proportional to 123.64, 170.62 and 68.38

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Solution

The fourth proportional to 123.64, 170.62 and 68.38 is: 94.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.64 : 170.62 = 68.38 : x
  2. Step 2: Convert to fraction form
    123.64/170.62 = 68.38/x
  3. Step 3: Cross multiply
    123.64x = 170.62 × 68.38
  4. Step 4: Simplify right side
    123.64x = 11,666.30
  5. Step 5: Solve for x
    x = 11,666.30/123.64
  6. Step 6: Final answer
    x = 94.36

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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.