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Finding the Fourth Proportional to 94.02, 129.78 and 72.16

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Solution

The fourth proportional to 94.02, 129.78 and 72.16 is: 99.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.02 : 129.78 = 72.16 : x
  2. Step 2: Convert to fraction form
    94.02/129.78 = 72.16/x
  3. Step 3: Cross multiply
    94.02x = 129.78 × 72.16
  4. Step 4: Simplify right side
    94.02x = 9,364.92
  5. Step 5: Solve for x
    x = 9,364.92/94.02
  6. Step 6: Final answer
    x = 99.61

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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.