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Finding the Fourth Proportional to 75.16, 112.56 and 69.40

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Solution

The fourth proportional to 75.16, 112.56 and 69.40 is: 103.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.16 : 112.56 = 69.40 : x
  2. Step 2: Convert to fraction form
    75.16/112.56 = 69.40/x
  3. Step 3: Cross multiply
    75.16x = 112.56 × 69.40
  4. Step 4: Simplify right side
    75.16x = 7,811.66
  5. Step 5: Solve for x
    x = 7,811.66/75.16
  6. Step 6: Final answer
    x = 103.93

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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.