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Finding the Fourth Proportional to 821.90, 1,232.78 and 274.07

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Solution

The fourth proportional to 821.90, 1,232.78 and 274.07 is: 411.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.90 : 1,232.78 = 274.07 : x
  2. Step 2: Convert to fraction form
    821.90/1,232.78 = 274.07/x
  3. Step 3: Cross multiply
    821.90x = 1,232.78 × 274.07
  4. Step 4: Simplify right side
    821.90x = 337,860.48
  5. Step 5: Solve for x
    x = 337,860.48/821.90
  6. Step 6: Final answer
    x = 411.07

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Double scale
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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.