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Finding the Fourth Proportional to 44.25, 66.39 and 42.90

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Solution

The fourth proportional to 44.25, 66.39 and 42.90 is: 64.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    44.25 : 66.39 = 42.90 : x
  2. Step 2: Convert to fraction form
    44.25/66.39 = 42.90/x
  3. Step 3: Cross multiply
    44.25x = 66.39 × 42.90
  4. Step 4: Simplify right side
    44.25x = 2,848.13
  5. Step 5: Solve for x
    x = 2,848.13/44.25
  6. Step 6: Final answer
    x = 64.36

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.