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Finding the Fourth Proportional to 75.88, 105.16 and 61.48

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Solution

The fourth proportional to 75.88, 105.16 and 61.48 is: 85.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.88 : 105.16 = 61.48 : x
  2. Step 2: Convert to fraction form
    75.88/105.16 = 61.48/x
  3. Step 3: Cross multiply
    75.88x = 105.16 × 61.48
  4. Step 4: Simplify right side
    75.88x = 6,465.24
  5. Step 5: Solve for x
    x = 6,465.24/75.88
  6. Step 6: Final answer
    x = 85.20

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.