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Finding the Fourth Proportional to 75.74, 113.45 and 45.21

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Solution

The fourth proportional to 75.74, 113.45 and 45.21 is: 67.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.74 : 113.45 = 45.21 : x
  2. Step 2: Convert to fraction form
    75.74/113.45 = 45.21/x
  3. Step 3: Cross multiply
    75.74x = 113.45 × 45.21
  4. Step 4: Simplify right side
    75.74x = 5,129.07
  5. Step 5: Solve for x
    x = 5,129.07/75.74
  6. Step 6: Final answer
    x = 67.72

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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.