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Finding the Fourth Proportional to 75.49, 113.25 and 21.39

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Solution

The fourth proportional to 75.49, 113.25 and 21.39 is: 32.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.49 : 113.25 = 21.39 : x
  2. Step 2: Convert to fraction form
    75.49/113.25 = 21.39/x
  3. Step 3: Cross multiply
    75.49x = 113.25 × 21.39
  4. Step 4: Simplify right side
    75.49x = 2,421.85
  5. Step 5: Solve for x
    x = 2,421.85/75.49
  6. Step 6: Final answer
    x = 32.08

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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.