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Finding the Fourth Proportional to 75.14, 112.50 and 61.78

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Solution

The fourth proportional to 75.14, 112.50 and 61.78 is: 92.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.14 : 112.50 = 61.78 : x
  2. Step 2: Convert to fraction form
    75.14/112.50 = 61.78/x
  3. Step 3: Cross multiply
    75.14x = 112.50 × 61.78
  4. Step 4: Simplify right side
    75.14x = 6,950.25
  5. Step 5: Solve for x
    x = 6,950.25/75.14
  6. Step 6: Final answer
    x = 92.50

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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.