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Finding the Fourth Proportional to 761.08, 1,140.78 and 395.80

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Solution

The fourth proportional to 761.08, 1,140.78 and 395.80 is: 593.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.08 : 1,140.78 = 395.80 : x
  2. Step 2: Convert to fraction form
    761.08/1,140.78 = 395.80/x
  3. Step 3: Cross multiply
    761.08x = 1,140.78 × 395.80
  4. Step 4: Simplify right side
    761.08x = 451,520.72
  5. Step 5: Solve for x
    x = 451,520.72/761.08
  6. Step 6: Final answer
    x = 593.26

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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.