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Finding the Fourth Proportional to 94.20, 129.95 and 57.34

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Solution

The fourth proportional to 94.20, 129.95 and 57.34 is: 79.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.20 : 129.95 = 57.34 : x
  2. Step 2: Convert to fraction form
    94.20/129.95 = 57.34/x
  3. Step 3: Cross multiply
    94.20x = 129.95 × 57.34
  4. Step 4: Simplify right side
    94.20x = 7,451.75
  5. Step 5: Solve for x
    x = 7,451.75/94.20
  6. Step 6: Final answer
    x = 79.11

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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.