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Finding the Fourth Proportional to 75.40, 112.55 and 61.60

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Solution

The fourth proportional to 75.40, 112.55 and 61.60 is: 91.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.40 : 112.55 = 61.60 : x
  2. Step 2: Convert to fraction form
    75.40/112.55 = 61.60/x
  3. Step 3: Cross multiply
    75.40x = 112.55 × 61.60
  4. Step 4: Simplify right side
    75.40x = 6,933.08
  5. Step 5: Solve for x
    x = 6,933.08/75.40
  6. Step 6: Final answer
    x = 91.95

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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.