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Finding the Fourth Proportional to 520.16, 780.04 and 211.92

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Solution

The fourth proportional to 520.16, 780.04 and 211.92 is: 317.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.16 : 780.04 = 211.92 : x
  2. Step 2: Convert to fraction form
    520.16/780.04 = 211.92/x
  3. Step 3: Cross multiply
    520.16x = 780.04 × 211.92
  4. Step 4: Simplify right side
    520.16x = 165,306.08
  5. Step 5: Solve for x
    x = 165,306.08/520.16
  6. Step 6: Final answer
    x = 317.80

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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.