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Finding the Fourth Proportional to 761.67, 1,142.57 and 213.86

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Solution

The fourth proportional to 761.67, 1,142.57 and 213.86 is: 320.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.67 : 1,142.57 = 213.86 : x
  2. Step 2: Convert to fraction form
    761.67/1,142.57 = 213.86/x
  3. Step 3: Cross multiply
    761.67x = 1,142.57 × 213.86
  4. Step 4: Simplify right side
    761.67x = 244,353.41
  5. Step 5: Solve for x
    x = 244,353.41/761.67
  6. Step 6: Final answer
    x = 320.81

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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.