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Finding the Fourth Proportional to 1,147.29, 1,717.29 and 872.30

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Solution

The fourth proportional to 1,147.29, 1,717.29 and 872.30 is: 1,305.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,147.29 : 1,717.29 = 872.30 : x
  2. Step 2: Convert to fraction form
    1,147.29/1,717.29 = 872.30/x
  3. Step 3: Cross multiply
    1,147.29x = 1,717.29 × 872.30
  4. Step 4: Simplify right side
    1,147.29x = 1,497,983.48
  5. Step 5: Solve for x
    x = 1,497,983.48/1,147.29
  6. Step 6: Final answer
    x = 1,305.67

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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.