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Finding the Fourth Proportional to 694.28, 1,040.64 and 283.31

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Solution

The fourth proportional to 694.28, 1,040.64 and 283.31 is: 424.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.28 : 1,040.64 = 283.31 : x
  2. Step 2: Convert to fraction form
    694.28/1,040.64 = 283.31/x
  3. Step 3: Cross multiply
    694.28x = 1,040.64 × 283.31
  4. Step 4: Simplify right side
    694.28x = 294,827.38
  5. Step 5: Solve for x
    x = 294,827.38/694.28
  6. Step 6: Final answer
    x = 424.66

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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.