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Finding the Fourth Proportional to 349.74, 521.78 and 318.30

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Solution

The fourth proportional to 349.74, 521.78 and 318.30 is: 474.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    349.74 : 521.78 = 318.30 : x
  2. Step 2: Convert to fraction form
    349.74/521.78 = 318.30/x
  3. Step 3: Cross multiply
    349.74x = 521.78 × 318.30
  4. Step 4: Simplify right side
    349.74x = 166,080.98
  5. Step 5: Solve for x
    x = 166,080.98/349.74
  6. Step 6: Final answer
    x = 474.87

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.