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Finding the Fourth Proportional to 169.19, 253.57 and 77.87

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Solution

The fourth proportional to 169.19, 253.57 and 77.87 is: 116.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    169.19 : 253.57 = 77.87 : x
  2. Step 2: Convert to fraction form
    169.19/253.57 = 77.87/x
  3. Step 3: Cross multiply
    169.19x = 253.57 × 77.87
  4. Step 4: Simplify right side
    169.19x = 19,744.03
  5. Step 5: Solve for x
    x = 19,744.03/169.19
  6. Step 6: Final answer
    x = 116.70

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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.