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Finding the Fourth Proportional to 520.91, 780.81 and 174.15

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Solution

The fourth proportional to 520.91, 780.81 and 174.15 is: 261.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.91 : 780.81 = 174.15 : x
  2. Step 2: Convert to fraction form
    520.91/780.81 = 174.15/x
  3. Step 3: Cross multiply
    520.91x = 780.81 × 174.15
  4. Step 4: Simplify right side
    520.91x = 135,978.06
  5. Step 5: Solve for x
    x = 135,978.06/520.91
  6. Step 6: Final answer
    x = 261.04

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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.