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Finding the Fourth Proportional to 520.68, 781.26 and 264.36

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Solution

The fourth proportional to 520.68, 781.26 and 264.36 is: 396.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.68 : 781.26 = 264.36 : x
  2. Step 2: Convert to fraction form
    520.68/781.26 = 264.36/x
  3. Step 3: Cross multiply
    520.68x = 781.26 × 264.36
  4. Step 4: Simplify right side
    520.68x = 206,533.89
  5. Step 5: Solve for x
    x = 206,533.89/520.68
  6. Step 6: Final answer
    x = 396.66

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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.