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Finding the Fourth Proportional to 84.65, 126.35 and 77.43

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Solution

The fourth proportional to 84.65, 126.35 and 77.43 is: 115.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.65 : 126.35 = 77.43 : x
  2. Step 2: Convert to fraction form
    84.65/126.35 = 77.43/x
  3. Step 3: Cross multiply
    84.65x = 126.35 × 77.43
  4. Step 4: Simplify right side
    84.65x = 9,783.19
  5. Step 5: Solve for x
    x = 9,783.19/84.65
  6. Step 6: Final answer
    x = 115.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.