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Finding the Fourth Proportional to 816.32, 1,126.64 and 521.92

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Solution

The fourth proportional to 816.32, 1,126.64 and 521.92 is: 720.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.32 : 1,126.64 = 521.92 : x
  2. Step 2: Convert to fraction form
    816.32/1,126.64 = 521.92/x
  3. Step 3: Cross multiply
    816.32x = 1,126.64 × 521.92
  4. Step 4: Simplify right side
    816.32x = 588,015.95
  5. Step 5: Solve for x
    x = 588,015.95/816.32
  6. Step 6: Final answer
    x = 720.33

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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.