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Finding the Fourth Proportional to 75.42, 112.68 and 67.77

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Solution

The fourth proportional to 75.42, 112.68 and 67.77 is: 101.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.42 : 112.68 = 67.77 : x
  2. Step 2: Convert to fraction form
    75.42/112.68 = 67.77/x
  3. Step 3: Cross multiply
    75.42x = 112.68 × 67.77
  4. Step 4: Simplify right side
    75.42x = 7,636.32
  5. Step 5: Solve for x
    x = 7,636.32/75.42
  6. Step 6: Final answer
    x = 101.25

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.