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Finding the Fourth Proportional to 880.33, 1,320.63 and 393.79

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Solution

The fourth proportional to 880.33, 1,320.63 and 393.79 is: 590.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.33 : 1,320.63 = 393.79 : x
  2. Step 2: Convert to fraction form
    880.33/1,320.63 = 393.79/x
  3. Step 3: Cross multiply
    880.33x = 1,320.63 × 393.79
  4. Step 4: Simplify right side
    880.33x = 520,050.89
  5. Step 5: Solve for x
    x = 520,050.89/880.33
  6. Step 6: Final answer
    x = 590.75

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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.