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Finding the Fourth Proportional to 318.42, 479.49 and 278.34

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Solution

The fourth proportional to 318.42, 479.49 and 278.34 is: 419.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.42 : 479.49 = 278.34 : x
  2. Step 2: Convert to fraction form
    318.42/479.49 = 278.34/x
  3. Step 3: Cross multiply
    318.42x = 479.49 × 278.34
  4. Step 4: Simplify right side
    318.42x = 133,461.25
  5. Step 5: Solve for x
    x = 133,461.25/318.42
  6. Step 6: Final answer
    x = 419.14

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These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.