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Finding the Fourth Proportional to 322.31, 479.64 and 318.89

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Solution

The fourth proportional to 322.31, 479.64 and 318.89 is: 474.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    322.31 : 479.64 = 318.89 : x
  2. Step 2: Convert to fraction form
    322.31/479.64 = 318.89/x
  3. Step 3: Cross multiply
    322.31x = 479.64 × 318.89
  4. Step 4: Simplify right side
    322.31x = 152,952.40
  5. Step 5: Solve for x
    x = 152,952.40/322.31
  6. Step 6: Final answer
    x = 474.55

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.