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Finding the Fourth Proportional to 761.25, 1,055.37 and 721.73

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Solution

The fourth proportional to 761.25, 1,055.37 and 721.73 is: 1,000.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.25 : 1,055.37 = 721.73 : x
  2. Step 2: Convert to fraction form
    761.25/1,055.37 = 721.73/x
  3. Step 3: Cross multiply
    761.25x = 1,055.37 × 721.73
  4. Step 4: Simplify right side
    761.25x = 761,692.19
  5. Step 5: Solve for x
    x = 761,692.19/761.25
  6. Step 6: Final answer
    x = 1,000.58

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.