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Finding the Fourth Proportional to 75.79, 112.83 and 72.31

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Solution

The fourth proportional to 75.79, 112.83 and 72.31 is: 107.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.79 : 112.83 = 72.31 : x
  2. Step 2: Convert to fraction form
    75.79/112.83 = 72.31/x
  3. Step 3: Cross multiply
    75.79x = 112.83 × 72.31
  4. Step 4: Simplify right side
    75.79x = 8,158.74
  5. Step 5: Solve for x
    x = 8,158.74/75.79
  6. Step 6: Final answer
    x = 107.65

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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.