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Finding the Fourth Proportional to 317.31, 477.18 and 289.38

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Solution

The fourth proportional to 317.31, 477.18 and 289.38 is: 435.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    317.31 : 477.18 = 289.38 : x
  2. Step 2: Convert to fraction form
    317.31/477.18 = 289.38/x
  3. Step 3: Cross multiply
    317.31x = 477.18 × 289.38
  4. Step 4: Simplify right side
    317.31x = 138,086.35
  5. Step 5: Solve for x
    x = 138,086.35/317.31
  6. Step 6: Final answer
    x = 435.18

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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.