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Finding the Fourth Proportional to 71.15, 98.20 and 40.06

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Solution

The fourth proportional to 71.15, 98.20 and 40.06 is: 55.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.15 : 98.20 = 40.06 : x
  2. Step 2: Convert to fraction form
    71.15/98.20 = 40.06/x
  3. Step 3: Cross multiply
    71.15x = 98.20 × 40.06
  4. Step 4: Simplify right side
    71.15x = 3,933.94
  5. Step 5: Solve for x
    x = 3,933.94/71.15
  6. Step 6: Final answer
    x = 55.29

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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.