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Finding the Fourth Proportional to 104.72, 144.40 and 90

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Solution

The fourth proportional to 104.72, 144.40 and 90 is: 124.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    104.72 : 144.40 = 90 : x
  2. Step 2: Convert to fraction form
    104.72/144.40 = 90/x
  3. Step 3: Cross multiply
    104.72x = 144.40 × 90
  4. Step 4: Simplify right side
    104.72x = 12,996
  5. Step 5: Solve for x
    x = 12,996/104.72
  6. Step 6: Final answer
    x = 124.10

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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.