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Finding the Fourth Proportional to 343.16, 513.92 and 278.90

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Solution

The fourth proportional to 343.16, 513.92 and 278.90 is: 417.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.16 : 513.92 = 278.90 : x
  2. Step 2: Convert to fraction form
    343.16/513.92 = 278.90/x
  3. Step 3: Cross multiply
    343.16x = 513.92 × 278.90
  4. Step 4: Simplify right side
    343.16x = 143,330.42
  5. Step 5: Solve for x
    x = 143,330.42/343.16
  6. Step 6: Final answer
    x = 417.68

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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.