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Finding the Fourth Proportional to 123.65, 170.65 and 74.55

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Solution

The fourth proportional to 123.65, 170.65 and 74.55 is: 102.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.65 : 170.65 = 74.55 : x
  2. Step 2: Convert to fraction form
    123.65/170.65 = 74.55/x
  3. Step 3: Cross multiply
    123.65x = 170.65 × 74.55
  4. Step 4: Simplify right side
    123.65x = 12,722.69
  5. Step 5: Solve for x
    x = 12,722.69/123.65
  6. Step 6: Final answer
    x = 102.89

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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.