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Finding the Fourth Proportional to 520.43, 781.25 and 276.89

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Solution

The fourth proportional to 520.43, 781.25 and 276.89 is: 415.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.43 : 781.25 = 276.89 : x
  2. Step 2: Convert to fraction form
    520.43/781.25 = 276.89/x
  3. Step 3: Cross multiply
    520.43x = 781.25 × 276.89
  4. Step 4: Simplify right side
    520.43x = 216,315.02
  5. Step 5: Solve for x
    x = 216,315.02/520.43
  6. Step 6: Final answer
    x = 415.65

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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.