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Finding the Fourth Proportional to 880.62, 1,320.57 and 393.90

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Solution

The fourth proportional to 880.62, 1,320.57 and 393.90 is: 590.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.62 : 1,320.57 = 393.90 : x
  2. Step 2: Convert to fraction form
    880.62/1,320.57 = 393.90/x
  3. Step 3: Cross multiply
    880.62x = 1,320.57 × 393.90
  4. Step 4: Simplify right side
    880.62x = 520,172.52
  5. Step 5: Solve for x
    x = 520,172.52/880.62
  6. Step 6: Final answer
    x = 590.69

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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.