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Finding the Fourth Proportional to 872.01, 1,305.67 and 761.28

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Solution

The fourth proportional to 872.01, 1,305.67 and 761.28 is: 1,139.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.01 : 1,305.67 = 761.28 : x
  2. Step 2: Convert to fraction form
    872.01/1,305.67 = 761.28/x
  3. Step 3: Cross multiply
    872.01x = 1,305.67 × 761.28
  4. Step 4: Simplify right side
    872.01x = 993,980.46
  5. Step 5: Solve for x
    x = 993,980.46/872.01
  6. Step 6: Final answer
    x = 1,139.87

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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.