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Finding the Fourth Proportional to 761.67, 1,140.44 and 395.69

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Solution

The fourth proportional to 761.67, 1,140.44 and 395.69 is: 592.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.67 : 1,140.44 = 395.69 : x
  2. Step 2: Convert to fraction form
    761.67/1,140.44 = 395.69/x
  3. Step 3: Cross multiply
    761.67x = 1,140.44 × 395.69
  4. Step 4: Simplify right side
    761.67x = 451,253.02
  5. Step 5: Solve for x
    x = 451,253.02/761.67
  6. Step 6: Final answer
    x = 592.45

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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.