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Finding the Fourth Proportional to 761.63, 1,140.39 and 395.66

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Solution

The fourth proportional to 761.63, 1,140.39 and 395.66 is: 592.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.63 : 1,140.39 = 395.66 : x
  2. Step 2: Convert to fraction form
    761.63/1,140.39 = 395.66/x
  3. Step 3: Cross multiply
    761.63x = 1,140.39 × 395.66
  4. Step 4: Simplify right side
    761.63x = 451,201.01
  5. Step 5: Solve for x
    x = 451,201.01/761.63
  6. Step 6: Final answer
    x = 592.42

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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.