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Finding the Fourth Proportional to 317.85, 476.88 and 135.21

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Solution

The fourth proportional to 317.85, 476.88 and 135.21 is: 202.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.85 : 476.88 = 135.21 : x
  2. Step 2: Convert to fraction form
    317.85/476.88 = 135.21/x
  3. Step 3: Cross multiply
    317.85x = 476.88 × 135.21
  4. Step 4: Simplify right side
    317.85x = 64,478.94
  5. Step 5: Solve for x
    x = 64,478.94/317.85
  6. Step 6: Final answer
    x = 202.86

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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.