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Finding the Fourth Proportional to 48.40, 66.64 and 41.80

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Solution

The fourth proportional to 48.40, 66.64 and 41.80 is: 57.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    48.40 : 66.64 = 41.80 : x
  2. Step 2: Convert to fraction form
    48.40/66.64 = 41.80/x
  3. Step 3: Cross multiply
    48.40x = 66.64 × 41.80
  4. Step 4: Simplify right side
    48.40x = 2,785.55
  5. Step 5: Solve for x
    x = 2,785.55/48.40
  6. Step 6: Final answer
    x = 57.55

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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.