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Finding the Fourth Proportional to 761.31, 1,141.97 and 486.54

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Solution

The fourth proportional to 761.31, 1,141.97 and 486.54 is: 729.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.31 : 1,141.97 = 486.54 : x
  2. Step 2: Convert to fraction form
    761.31/1,141.97 = 486.54/x
  3. Step 3: Cross multiply
    761.31x = 1,141.97 × 486.54
  4. Step 4: Simplify right side
    761.31x = 555,611.65
  5. Step 5: Solve for x
    x = 555,611.65/761.31
  6. Step 6: Final answer
    x = 729.81

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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.