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Finding the Fourth Proportional to 876.70, 1,313.70 and 828.10

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Solution

The fourth proportional to 876.70, 1,313.70 and 828.10 is: 1,240.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.70 : 1,313.70 = 828.10 : x
  2. Step 2: Convert to fraction form
    876.70/1,313.70 = 828.10/x
  3. Step 3: Cross multiply
    876.70x = 1,313.70 × 828.10
  4. Step 4: Simplify right side
    876.70x = 1,087,874.97
  5. Step 5: Solve for x
    x = 1,087,874.97/876.70
  6. Step 6: Final answer
    x = 1,240.87

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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.