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Finding the Fourth Proportional to 317.34, 477.09 and 256.89

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Solution

The fourth proportional to 317.34, 477.09 and 256.89 is: 386.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.34 : 477.09 = 256.89 : x
  2. Step 2: Convert to fraction form
    317.34/477.09 = 256.89/x
  3. Step 3: Cross multiply
    317.34x = 477.09 × 256.89
  4. Step 4: Simplify right side
    317.34x = 122,559.65
  5. Step 5: Solve for x
    x = 122,559.65/317.34
  6. Step 6: Final answer
    x = 386.21

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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.