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Finding the Fourth Proportional to 343.99, 518.68 and 315.29

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Solution

The fourth proportional to 343.99, 518.68 and 315.29 is: 475.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.99 : 518.68 = 315.29 : x
  2. Step 2: Convert to fraction form
    343.99/518.68 = 315.29/x
  3. Step 3: Cross multiply
    343.99x = 518.68 × 315.29
  4. Step 4: Simplify right side
    343.99x = 163,532.02
  5. Step 5: Solve for x
    x = 163,532.02/343.99
  6. Step 6: Final answer
    x = 475.40

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Why These Related Problems?

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