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Finding the Fourth Proportional to 76.24, 105.10 and 61.68

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Solution

The fourth proportional to 76.24, 105.10 and 61.68 is: 85.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.24 : 105.10 = 61.68 : x
  2. Step 2: Convert to fraction form
    76.24/105.10 = 61.68/x
  3. Step 3: Cross multiply
    76.24x = 105.10 × 61.68
  4. Step 4: Simplify right side
    76.24x = 6,482.57
  5. Step 5: Solve for x
    x = 6,482.57/76.24
  6. Step 6: Final answer
    x = 85.03

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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.