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Finding the Fourth Proportional to 1,335.75, 1,998.69 and 816.20

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Solution

The fourth proportional to 1,335.75, 1,998.69 and 816.20 is: 1,221.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,335.75 : 1,998.69 = 816.20 : x
  2. Step 2: Convert to fraction form
    1,335.75/1,998.69 = 816.20/x
  3. Step 3: Cross multiply
    1,335.75x = 1,998.69 × 816.20
  4. Step 4: Simplify right side
    1,335.75x = 1,631,320.78
  5. Step 5: Solve for x
    x = 1,631,320.78/1,335.75
  6. Step 6: Final answer
    x = 1,221.28

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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.