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Finding the Fourth Proportional to 75.90, 113.78 and 45.48

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Solution

The fourth proportional to 75.90, 113.78 and 45.48 is: 68.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.90 : 113.78 = 45.48 : x
  2. Step 2: Convert to fraction form
    75.90/113.78 = 45.48/x
  3. Step 3: Cross multiply
    75.90x = 113.78 × 45.48
  4. Step 4: Simplify right side
    75.90x = 5,174.71
  5. Step 5: Solve for x
    x = 5,174.71/75.90
  6. Step 6: Final answer
    x = 68.18

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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.