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Finding the Fourth Proportional to 76.30, 113.62 and 75.39

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Solution

The fourth proportional to 76.30, 113.62 and 75.39 is: 112.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.30 : 113.62 = 75.39 : x
  2. Step 2: Convert to fraction form
    76.30/113.62 = 75.39/x
  3. Step 3: Cross multiply
    76.30x = 113.62 × 75.39
  4. Step 4: Simplify right side
    76.30x = 8,565.81
  5. Step 5: Solve for x
    x = 8,565.81/76.30
  6. Step 6: Final answer
    x = 112.26

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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.