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Finding the Fourth Proportional to 342.66, 516.51 and 320.40

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Solution

The fourth proportional to 342.66, 516.51 and 320.40 is: 482.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.66 : 516.51 = 320.40 : x
  2. Step 2: Convert to fraction form
    342.66/516.51 = 320.40/x
  3. Step 3: Cross multiply
    342.66x = 516.51 × 320.40
  4. Step 4: Simplify right side
    342.66x = 165,489.80
  5. Step 5: Solve for x
    x = 165,489.80/342.66
  6. Step 6: Final answer
    x = 482.96

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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.