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Finding the Fourth Proportional to 609.49, 913.76 and 316.86

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Solution

The fourth proportional to 609.49, 913.76 and 316.86 is: 475.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.49 : 913.76 = 316.86 : x
  2. Step 2: Convert to fraction form
    609.49/913.76 = 316.86/x
  3. Step 3: Cross multiply
    609.49x = 913.76 × 316.86
  4. Step 4: Simplify right side
    609.49x = 289,533.99
  5. Step 5: Solve for x
    x = 289,533.99/609.49
  6. Step 6: Final answer
    x = 475.04

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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.