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Finding the Fourth Proportional to 75.00, 112.50 and 20.89

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Solution

The fourth proportional to 75.00, 112.50 and 20.89 is: 31.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.00 : 112.50 = 20.89 : x
  2. Step 2: Convert to fraction form
    75.00/112.50 = 20.89/x
  3. Step 3: Cross multiply
    75.00x = 112.50 × 20.89
  4. Step 4: Simplify right side
    75.00x = 2,350.13
  5. Step 5: Solve for x
    x = 2,350.13/75.00
  6. Step 6: Final answer
    x = 31.34

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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.