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Finding the Fourth Proportional to 76.50, 114.79 and 58.50

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Solution

The fourth proportional to 76.50, 114.79 and 58.50 is: 87.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.50 : 114.79 = 58.50 : x
  2. Step 2: Convert to fraction form
    76.50/114.79 = 58.50/x
  3. Step 3: Cross multiply
    76.50x = 114.79 × 58.50
  4. Step 4: Simplify right side
    76.50x = 6,715.22
  5. Step 5: Solve for x
    x = 6,715.22/76.50
  6. Step 6: Final answer
    x = 87.78

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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.