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Finding the Fourth Proportional to 49.21, 74.16 and 44.40

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Solution

The fourth proportional to 49.21, 74.16 and 44.40 is: 66.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    49.21 : 74.16 = 44.40 : x
  2. Step 2: Convert to fraction form
    49.21/74.16 = 44.40/x
  3. Step 3: Cross multiply
    49.21x = 74.16 × 44.40
  4. Step 4: Simplify right side
    49.21x = 3,292.70
  5. Step 5: Solve for x
    x = 3,292.70/49.21
  6. Step 6: Final answer
    x = 66.91

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.