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Finding the Fourth Proportional to 94.30, 129.94 and 72.43

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Solution

The fourth proportional to 94.30, 129.94 and 72.43 is: 99.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.30 : 129.94 = 72.43 : x
  2. Step 2: Convert to fraction form
    94.30/129.94 = 72.43/x
  3. Step 3: Cross multiply
    94.30x = 129.94 × 72.43
  4. Step 4: Simplify right side
    94.30x = 9,411.05
  5. Step 5: Solve for x
    x = 9,411.05/94.30
  6. Step 6: Final answer
    x = 99.80

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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.