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Finding the Fourth Proportional to 94.02, 129.69 and 57.18

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Solution

The fourth proportional to 94.02, 129.69 and 57.18 is: 78.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.02 : 129.69 = 57.18 : x
  2. Step 2: Convert to fraction form
    94.02/129.69 = 57.18/x
  3. Step 3: Cross multiply
    94.02x = 129.69 × 57.18
  4. Step 4: Simplify right side
    94.02x = 7,415.67
  5. Step 5: Solve for x
    x = 7,415.67/94.02
  6. Step 6: Final answer
    x = 78.87

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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.