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Finding the Fourth Proportional to 884.70, 1,325.34 and 687.20

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Solution

The fourth proportional to 884.70, 1,325.34 and 687.20 is: 1,029.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    884.70 : 1,325.34 = 687.20 : x
  2. Step 2: Convert to fraction form
    884.70/1,325.34 = 687.20/x
  3. Step 3: Cross multiply
    884.70x = 1,325.34 × 687.20
  4. Step 4: Simplify right side
    884.70x = 910,767.02
  5. Step 5: Solve for x
    x = 910,767.02/884.70
  6. Step 6: Final answer
    x = 1,029.46

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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.