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Finding the Fourth Proportional to 319.17, 478.92 and 318.20

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Solution

The fourth proportional to 319.17, 478.92 and 318.20 is: 477.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    319.17 : 478.92 = 318.20 : x
  2. Step 2: Convert to fraction form
    319.17/478.92 = 318.20/x
  3. Step 3: Cross multiply
    319.17x = 478.92 × 318.20
  4. Step 4: Simplify right side
    319.17x = 152,392.34
  5. Step 5: Solve for x
    x = 152,392.34/319.17
  6. Step 6: Final answer
    x = 477.46

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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.