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Finding the Fourth Proportional to 880.89, 1,321.29 and 393.98

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Solution

The fourth proportional to 880.89, 1,321.29 and 393.98 is: 590.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.89 : 1,321.29 = 393.98 : x
  2. Step 2: Convert to fraction form
    880.89/1,321.29 = 393.98/x
  3. Step 3: Cross multiply
    880.89x = 1,321.29 × 393.98
  4. Step 4: Simplify right side
    880.89x = 520,555.23
  5. Step 5: Solve for x
    x = 520,555.23/880.89
  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.