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Finding the Fourth Proportional to 880.91, 1,321.80 and 393.83

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Solution

The fourth proportional to 880.91, 1,321.80 and 393.83 is: 590.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.91 : 1,321.80 = 393.83 : x
  2. Step 2: Convert to fraction form
    880.91/1,321.80 = 393.83/x
  3. Step 3: Cross multiply
    880.91x = 1,321.80 × 393.83
  4. Step 4: Simplify right side
    880.91x = 520,564.49
  5. Step 5: Solve for x
    x = 520,564.49/880.91
  6. Step 6: Final answer
    x = 590.94

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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.