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Finding the Fourth Proportional to 76.19, 105.14 and 58.66

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Solution

The fourth proportional to 76.19, 105.14 and 58.66 is: 80.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.19 : 105.14 = 58.66 : x
  2. Step 2: Convert to fraction form
    76.19/105.14 = 58.66/x
  3. Step 3: Cross multiply
    76.19x = 105.14 × 58.66
  4. Step 4: Simplify right side
    76.19x = 6,167.40
  5. Step 5: Solve for x
    x = 6,167.40/76.19
  6. Step 6: Final answer
    x = 80.95

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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.