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Finding the Fourth Proportional to 374.90, 516.91 and 308.28

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Solution

The fourth proportional to 374.90, 516.91 and 308.28 is: 425.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.90 : 516.91 = 308.28 : x
  2. Step 2: Convert to fraction form
    374.90/516.91 = 308.28/x
  3. Step 3: Cross multiply
    374.90x = 516.91 × 308.28
  4. Step 4: Simplify right side
    374.90x = 159,353.01
  5. Step 5: Solve for x
    x = 159,353.01/374.90
  6. Step 6: Final answer
    x = 425.05

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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.