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Finding the Fourth Proportional to 824.07, 1,236.71 and 391.23

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Solution

The fourth proportional to 824.07, 1,236.71 and 391.23 is: 587.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.07 : 1,236.71 = 391.23 : x
  2. Step 2: Convert to fraction form
    824.07/1,236.71 = 391.23/x
  3. Step 3: Cross multiply
    824.07x = 1,236.71 × 391.23
  4. Step 4: Simplify right side
    824.07x = 483,838.05
  5. Step 5: Solve for x
    x = 483,838.05/824.07
  6. Step 6: Final answer
    x = 587.13

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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.