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Finding the Fourth Proportional to 123.69, 170.65 and 77.06

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Solution

The fourth proportional to 123.69, 170.65 and 77.06 is: 106.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    123.69 : 170.65 = 77.06 : x
  2. Step 2: Convert to fraction form
    123.69/170.65 = 77.06/x
  3. Step 3: Cross multiply
    123.69x = 170.65 × 77.06
  4. Step 4: Simplify right side
    123.69x = 13,150.29
  5. Step 5: Solve for x
    x = 13,150.29/123.69
  6. Step 6: Final answer
    x = 106.32

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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.