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Finding the Fourth Proportional to 824.58, 1,235.39 and 687.42

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Solution

The fourth proportional to 824.58, 1,235.39 and 687.42 is: 1,029.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.58 : 1,235.39 = 687.42 : x
  2. Step 2: Convert to fraction form
    824.58/1,235.39 = 687.42/x
  3. Step 3: Cross multiply
    824.58x = 1,235.39 × 687.42
  4. Step 4: Simplify right side
    824.58x = 849,228.36
  5. Step 5: Solve for x
    x = 849,228.36/824.58
  6. Step 6: Final answer
    x = 1,029.89

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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.