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Finding the Fourth Proportional to 872.69, 1,305.09 and 775.76

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Solution

The fourth proportional to 872.69, 1,305.09 and 775.76 is: 1,160.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.69 : 1,305.09 = 775.76 : x
  2. Step 2: Convert to fraction form
    872.69/1,305.09 = 775.76/x
  3. Step 3: Cross multiply
    872.69x = 1,305.09 × 775.76
  4. Step 4: Simplify right side
    872.69x = 1,012,430.09
  5. Step 5: Solve for x
    x = 1,012,430.09/872.69
  6. Step 6: Final answer
    x = 1,160.13

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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.