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Finding the Fourth Proportional to 519.92, 780.16 and 245.84

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Solution

The fourth proportional to 519.92, 780.16 and 245.84 is: 368.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    519.92 : 780.16 = 245.84 : x
  2. Step 2: Convert to fraction form
    519.92/780.16 = 245.84/x
  3. Step 3: Cross multiply
    519.92x = 780.16 × 245.84
  4. Step 4: Simplify right side
    519.92x = 191,794.53
  5. Step 5: Solve for x
    x = 191,794.53/519.92
  6. Step 6: Final answer
    x = 368.89

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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.