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Finding the Fourth Proportional to 824.79, 1,137.74 and 513.75

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Solution

The fourth proportional to 824.79, 1,137.74 and 513.75 is: 708.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.79 : 1,137.74 = 513.75 : x
  2. Step 2: Convert to fraction form
    824.79/1,137.74 = 513.75/x
  3. Step 3: Cross multiply
    824.79x = 1,137.74 × 513.75
  4. Step 4: Simplify right side
    824.79x = 584,511.36
  5. Step 5: Solve for x
    x = 584,511.36/824.79
  6. Step 6: Final answer
    x = 708.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.