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Finding the Fourth Proportional to 606.45, 909.68 and 317.85

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Solution

The fourth proportional to 606.45, 909.68 and 317.85 is: 476.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    606.45 : 909.68 = 317.85 : x
  2. Step 2: Convert to fraction form
    606.45/909.68 = 317.85/x
  3. Step 3: Cross multiply
    606.45x = 909.68 × 317.85
  4. Step 4: Simplify right side
    606.45x = 289,140.20
  5. Step 5: Solve for x
    x = 289,140.20/606.45
  6. Step 6: Final answer
    x = 476.78

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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.