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Finding the Fourth Proportional to 374.70, 516.78 and 256.74

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Solution

The fourth proportional to 374.70, 516.78 and 256.74 is: 354.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.70 : 516.78 = 256.74 : x
  2. Step 2: Convert to fraction form
    374.70/516.78 = 256.74/x
  3. Step 3: Cross multiply
    374.70x = 516.78 × 256.74
  4. Step 4: Simplify right side
    374.70x = 132,678.10
  5. Step 5: Solve for x
    x = 132,678.10/374.70
  6. Step 6: Final answer
    x = 354.09

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.