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Finding the Fourth Proportional to 317.86, 476.76 and 215.20

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Solution

The fourth proportional to 317.86, 476.76 and 215.20 is: 322.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.86 : 476.76 = 215.20 : x
  2. Step 2: Convert to fraction form
    317.86/476.76 = 215.20/x
  3. Step 3: Cross multiply
    317.86x = 476.76 × 215.20
  4. Step 4: Simplify right side
    317.86x = 102,598.75
  5. Step 5: Solve for x
    x = 102,598.75/317.86
  6. Step 6: Final answer
    x = 322.78

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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.