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Finding the Fourth Proportional to 84.59, 126.86 and 30.47

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Solution

The fourth proportional to 84.59, 126.86 and 30.47 is: 45.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.59 : 126.86 = 30.47 : x
  2. Step 2: Convert to fraction form
    84.59/126.86 = 30.47/x
  3. Step 3: Cross multiply
    84.59x = 126.86 × 30.47
  4. Step 4: Simplify right side
    84.59x = 3,865.59
  5. Step 5: Solve for x
    x = 3,865.59/84.59
  6. Step 6: Final answer
    x = 45.70

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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.