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Finding the Fourth Proportional to 374.20, 515.86 and 285.67

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Solution

The fourth proportional to 374.20, 515.86 and 285.67 is: 393.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.20 : 515.86 = 285.67 : x
  2. Step 2: Convert to fraction form
    374.20/515.86 = 285.67/x
  3. Step 3: Cross multiply
    374.20x = 515.86 × 285.67
  4. Step 4: Simplify right side
    374.20x = 147,365.73
  5. Step 5: Solve for x
    x = 147,365.73/374.20
  6. Step 6: Final answer
    x = 393.82

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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.