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Finding the Fourth Proportional to 317.07, 475.62 and 209.55

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Solution

The fourth proportional to 317.07, 475.62 and 209.55 is: 314.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.07 : 475.62 = 209.55 : x
  2. Step 2: Convert to fraction form
    317.07/475.62 = 209.55/x
  3. Step 3: Cross multiply
    317.07x = 475.62 × 209.55
  4. Step 4: Simplify right side
    317.07x = 99,666.17
  5. Step 5: Solve for x
    x = 99,666.17/317.07
  6. Step 6: Final answer
    x = 314.33

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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.