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Finding the Fourth Proportional to 824.24, 1,236.26 and 391.70

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Solution

The fourth proportional to 824.24, 1,236.26 and 391.70 is: 587.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.24 : 1,236.26 = 391.70 : x
  2. Step 2: Convert to fraction form
    824.24/1,236.26 = 391.70/x
  3. Step 3: Cross multiply
    824.24x = 1,236.26 × 391.70
  4. Step 4: Simplify right side
    824.24x = 484,247.11
  5. Step 5: Solve for x
    x = 484,247.11/824.24
  6. Step 6: Final answer
    x = 587.51

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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.