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Finding the Fourth Proportional to 822.31, 1,232.99 and 274.20

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Solution

The fourth proportional to 822.31, 1,232.99 and 274.20 is: 411.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.31 : 1,232.99 = 274.20 : x
  2. Step 2: Convert to fraction form
    822.31/1,232.99 = 274.20/x
  3. Step 3: Cross multiply
    822.31x = 1,232.99 × 274.20
  4. Step 4: Simplify right side
    822.31x = 338,079.69
  5. Step 5: Solve for x
    x = 338,079.69/822.31
  6. Step 6: Final answer
    x = 411.14

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Half scale
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Double scale
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Similar ratio
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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.