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Finding the Fourth Proportional to 76.14, 104.94 and 70.74

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Solution

The fourth proportional to 76.14, 104.94 and 70.74 is: 97.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.14 : 104.94 = 70.74 : x
  2. Step 2: Convert to fraction form
    76.14/104.94 = 70.74/x
  3. Step 3: Cross multiply
    76.14x = 104.94 × 70.74
  4. Step 4: Simplify right side
    76.14x = 7,423.46
  5. Step 5: Solve for x
    x = 7,423.46/76.14
  6. Step 6: Final answer
    x = 97.50

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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.