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Finding the Fourth Proportional to 816.36, 1,125.72 and 617.64

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Solution

The fourth proportional to 816.36, 1,125.72 and 617.64 is: 851.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.36 : 1,125.72 = 617.64 : x
  2. Step 2: Convert to fraction form
    816.36/1,125.72 = 617.64/x
  3. Step 3: Cross multiply
    816.36x = 1,125.72 × 617.64
  4. Step 4: Simplify right side
    816.36x = 695,289.70
  5. Step 5: Solve for x
    x = 695,289.70/816.36
  6. Step 6: Final answer
    x = 851.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.