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Finding the Fourth Proportional to 354.40, 531.24 and 191.86

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Solution

The fourth proportional to 354.40, 531.24 and 191.86 is: 287.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    354.40 : 531.24 = 191.86 : x
  2. Step 2: Convert to fraction form
    354.40/531.24 = 191.86/x
  3. Step 3: Cross multiply
    354.40x = 531.24 × 191.86
  4. Step 4: Simplify right side
    354.40x = 101,923.71
  5. Step 5: Solve for x
    x = 101,923.71/354.40
  6. Step 6: Final answer
    x = 287.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.