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Finding the Fourth Proportional to 84.72, 126.99 and 48.63

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Solution

The fourth proportional to 84.72, 126.99 and 48.63 is: 72.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.72 : 126.99 = 48.63 : x
  2. Step 2: Convert to fraction form
    84.72/126.99 = 48.63/x
  3. Step 3: Cross multiply
    84.72x = 126.99 × 48.63
  4. Step 4: Simplify right side
    84.72x = 6,175.52
  5. Step 5: Solve for x
    x = 6,175.52/84.72
  6. Step 6: Final answer
    x = 72.89

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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.