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Finding the Fourth Proportional to 48.11, 66.39 and 29.70

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Solution

The fourth proportional to 48.11, 66.39 and 29.70 is: 40.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.11 : 66.39 = 29.70 : x
  2. Step 2: Convert to fraction form
    48.11/66.39 = 29.70/x
  3. Step 3: Cross multiply
    48.11x = 66.39 × 29.70
  4. Step 4: Simplify right side
    48.11x = 1,971.78
  5. Step 5: Solve for x
    x = 1,971.78/48.11
  6. Step 6: Final answer
    x = 40.99

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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.