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Finding the Fourth Proportional to 978.62, 1,467.92 and 539.85

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Solution

The fourth proportional to 978.62, 1,467.92 and 539.85 is: 809.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    978.62 : 1,467.92 = 539.85 : x
  2. Step 2: Convert to fraction form
    978.62/1,467.92 = 539.85/x
  3. Step 3: Cross multiply
    978.62x = 1,467.92 × 539.85
  4. Step 4: Simplify right side
    978.62x = 792,456.61
  5. Step 5: Solve for x
    x = 792,456.61/978.62
  6. Step 6: Final answer
    x = 809.77

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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.