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Finding the Fourth Proportional to 824.40, 1,236.12 and 276.42

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Solution

The fourth proportional to 824.40, 1,236.12 and 276.42 is: 414.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.40 : 1,236.12 = 276.42 : x
  2. Step 2: Convert to fraction form
    824.40/1,236.12 = 276.42/x
  3. Step 3: Cross multiply
    824.40x = 1,236.12 × 276.42
  4. Step 4: Simplify right side
    824.40x = 341,688.29
  5. Step 5: Solve for x
    x = 341,688.29/824.40
  6. Step 6: Final answer
    x = 414.47

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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.