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Finding the Fourth Proportional to 475.54, 713.31 and 128.88

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Solution

The fourth proportional to 475.54, 713.31 and 128.88 is: 193.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    475.54 : 713.31 = 128.88 : x
  2. Step 2: Convert to fraction form
    475.54/713.31 = 128.88/x
  3. Step 3: Cross multiply
    475.54x = 713.31 × 128.88
  4. Step 4: Simplify right side
    475.54x = 91,929.99
  5. Step 5: Solve for x
    x = 91,929.99/475.54
  6. Step 6: Final answer
    x = 193.32

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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.