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Finding the Fourth Proportional to 75.77, 113.65 and 61.41

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Solution

The fourth proportional to 75.77, 113.65 and 61.41 is: 92.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.77 : 113.65 = 61.41 : x
  2. Step 2: Convert to fraction form
    75.77/113.65 = 61.41/x
  3. Step 3: Cross multiply
    75.77x = 113.65 × 61.41
  4. Step 4: Simplify right side
    75.77x = 6,979.25
  5. Step 5: Solve for x
    x = 6,979.25/75.77
  6. Step 6: Final answer
    x = 92.11

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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.