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Finding the Fourth Proportional to 44.36, 66.21 and 39.80

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Solution

The fourth proportional to 44.36, 66.21 and 39.80 is: 59.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    44.36 : 66.21 = 39.80 : x
  2. Step 2: Convert to fraction form
    44.36/66.21 = 39.80/x
  3. Step 3: Cross multiply
    44.36x = 66.21 × 39.80
  4. Step 4: Simplify right side
    44.36x = 2,635.16
  5. Step 5: Solve for x
    x = 2,635.16/44.36
  6. Step 6: Final answer
    x = 59.40

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.