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Finding the Fourth Proportional to 123.63, 170.61 and 74.51

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Solution

The fourth proportional to 123.63, 170.61 and 74.51 is: 102.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.63 : 170.61 = 74.51 : x
  2. Step 2: Convert to fraction form
    123.63/170.61 = 74.51/x
  3. Step 3: Cross multiply
    123.63x = 170.61 × 74.51
  4. Step 4: Simplify right side
    123.63x = 12,710.93
  5. Step 5: Solve for x
    x = 12,710.93/123.63
  6. Step 6: Final answer
    x = 102.82

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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.