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Finding the Fourth Proportional to 75.00, 112.49 and 20.88

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Solution

The fourth proportional to 75.00, 112.49 and 20.88 is: 31.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.00 : 112.49 = 20.88 : x
  2. Step 2: Convert to fraction form
    75.00/112.49 = 20.88/x
  3. Step 3: Cross multiply
    75.00x = 112.49 × 20.88
  4. Step 4: Simplify right side
    75.00x = 2,349.08
  5. Step 5: Solve for x
    x = 2,349.08/75.00
  6. Step 6: Final answer
    x = 31.32

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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.