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Finding the Fourth Proportional to 71.16, 98.13 and 48.78

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Solution

The fourth proportional to 71.16, 98.13 and 48.78 is: 67.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.16 : 98.13 = 48.78 : x
  2. Step 2: Convert to fraction form
    71.16/98.13 = 48.78/x
  3. Step 3: Cross multiply
    71.16x = 98.13 × 48.78
  4. Step 4: Simplify right side
    71.16x = 4,786.05
  5. Step 5: Solve for x
    x = 4,786.05/71.16
  6. Step 6: Final answer
    x = 67.26

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.