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Finding the Fourth Proportional to 94.80, 129.60 and 94.40

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Solution

The fourth proportional to 94.80, 129.60 and 94.40 is: 129.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    94.80 : 129.60 = 94.40 : x
  2. Step 2: Convert to fraction form
    94.80/129.60 = 94.40/x
  3. Step 3: Cross multiply
    94.80x = 129.60 × 94.40
  4. Step 4: Simplify right side
    94.80x = 12,234.24
  5. Step 5: Solve for x
    x = 12,234.24/94.80
  6. Step 6: Final answer
    x = 129.05

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.