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Finding the Fourth Proportional to 761.57, 1,142.43 and 213.83

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Solution

The fourth proportional to 761.57, 1,142.43 and 213.83 is: 320.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.57 : 1,142.43 = 213.83 : x
  2. Step 2: Convert to fraction form
    761.57/1,142.43 = 213.83/x
  3. Step 3: Cross multiply
    761.57x = 1,142.43 × 213.83
  4. Step 4: Simplify right side
    761.57x = 244,285.81
  5. Step 5: Solve for x
    x = 244,285.81/761.57
  6. Step 6: Final answer
    x = 320.77

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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.