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Finding the Fourth Proportional to 75.70, 104.35 and 61.12

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Solution

The fourth proportional to 75.70, 104.35 and 61.12 is: 84.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.70 : 104.35 = 61.12 : x
  2. Step 2: Convert to fraction form
    75.70/104.35 = 61.12/x
  3. Step 3: Cross multiply
    75.70x = 104.35 × 61.12
  4. Step 4: Simplify right side
    75.70x = 6,377.87
  5. Step 5: Solve for x
    x = 6,377.87/75.70
  6. Step 6: Final answer
    x = 84.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.