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Finding the Fourth Proportional to 84.07, 126.12 and 53.65

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Solution

The fourth proportional to 84.07, 126.12 and 53.65 is: 80.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.07 : 126.12 = 53.65 : x
  2. Step 2: Convert to fraction form
    84.07/126.12 = 53.65/x
  3. Step 3: Cross multiply
    84.07x = 126.12 × 53.65
  4. Step 4: Simplify right side
    84.07x = 6,765.71
  5. Step 5: Solve for x
    x = 6,765.71/84.07
  6. Step 6: Final answer
    x = 80.48

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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.