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Finding the Fourth Proportional to 816.10, 1,221.11 and 487.21

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Solution

The fourth proportional to 816.10, 1,221.11 and 487.21 is: 729.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    816.10 : 1,221.11 = 487.21 : x
  2. Step 2: Convert to fraction form
    816.10/1,221.11 = 487.21/x
  3. Step 3: Cross multiply
    816.10x = 1,221.11 × 487.21
  4. Step 4: Simplify right side
    816.10x = 594,937.00
  5. Step 5: Solve for x
    x = 594,937.00/816.10
  6. Step 6: Final answer
    x = 729.00

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1.5x scale

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.