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Finding the Fourth Proportional to 94.16, 129.48 and 79.28

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Solution

The fourth proportional to 94.16, 129.48 and 79.28 is: 109.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.16 : 129.48 = 79.28 : x
  2. Step 2: Convert to fraction form
    94.16/129.48 = 79.28/x
  3. Step 3: Cross multiply
    94.16x = 129.48 × 79.28
  4. Step 4: Simplify right side
    94.16x = 10,265.17
  5. Step 5: Solve for x
    x = 10,265.17/94.16
  6. Step 6: Final answer
    x = 109.02

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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.