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Finding the Fourth Proportional to 833.76, 1,249.56 and 399.60

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Solution

The fourth proportional to 833.76, 1,249.56 and 399.60 is: 598.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    833.76 : 1,249.56 = 399.60 : x
  2. Step 2: Convert to fraction form
    833.76/1,249.56 = 399.60/x
  3. Step 3: Cross multiply
    833.76x = 1,249.56 × 399.60
  4. Step 4: Simplify right side
    833.76x = 499,324.18
  5. Step 5: Solve for x
    x = 499,324.18/833.76
  6. Step 6: Final answer
    x = 598.88

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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.