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Finding the Fourth Proportional to 75.15, 113.29 and 67.32

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Solution

The fourth proportional to 75.15, 113.29 and 67.32 is: 101.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.15 : 113.29 = 67.32 : x
  2. Step 2: Convert to fraction form
    75.15/113.29 = 67.32/x
  3. Step 3: Cross multiply
    75.15x = 113.29 × 67.32
  4. Step 4: Simplify right side
    75.15x = 7,626.51
  5. Step 5: Solve for x
    x = 7,626.51/75.15
  6. Step 6: Final answer
    x = 101.48

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.