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Finding the Fourth Proportional to 609.16, 913.80 and 316.78

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Solution

The fourth proportional to 609.16, 913.80 and 316.78 is: 475.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.16 : 913.80 = 316.78 : x
  2. Step 2: Convert to fraction form
    609.16/913.80 = 316.78/x
  3. Step 3: Cross multiply
    609.16x = 913.80 × 316.78
  4. Step 4: Simplify right side
    609.16x = 289,473.56
  5. Step 5: Solve for x
    x = 289,473.56/609.16
  6. Step 6: Final answer
    x = 475.20

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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.