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Finding the Fourth Proportional to 761.37, 1,139.72 and 487.73

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Solution

The fourth proportional to 761.37, 1,139.72 and 487.73 is: 730.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.37 : 1,139.72 = 487.73 : x
  2. Step 2: Convert to fraction form
    761.37/1,139.72 = 487.73/x
  3. Step 3: Cross multiply
    761.37x = 1,139.72 × 487.73
  4. Step 4: Simplify right side
    761.37x = 555,869.94
  5. Step 5: Solve for x
    x = 555,869.94/761.37
  6. Step 6: Final answer
    x = 730.09

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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.