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Finding the Fourth Proportional to 475.45, 713.11 and 128.80

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Solution

The fourth proportional to 475.45, 713.11 and 128.80 is: 193.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.45 : 713.11 = 128.80 : x
  2. Step 2: Convert to fraction form
    475.45/713.11 = 128.80/x
  3. Step 3: Cross multiply
    475.45x = 713.11 × 128.80
  4. Step 4: Simplify right side
    475.45x = 91,848.57
  5. Step 5: Solve for x
    x = 91,848.57/475.45
  6. Step 6: Final answer
    x = 193.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.