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Finding the Fourth Proportional to 317.88, 475.86 and 209.40

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Solution

The fourth proportional to 317.88, 475.86 and 209.40 is: 313.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.88 : 475.86 = 209.40 : x
  2. Step 2: Convert to fraction form
    317.88/475.86 = 209.40/x
  3. Step 3: Cross multiply
    317.88x = 475.86 × 209.40
  4. Step 4: Simplify right side
    317.88x = 99,645.08
  5. Step 5: Solve for x
    x = 99,645.08/317.88
  6. Step 6: Final answer
    x = 313.47

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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.