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Finding the Fourth Proportional to 520.37, 781.12 and 289.70

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Solution

The fourth proportional to 520.37, 781.12 and 289.70 is: 434.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.37 : 781.12 = 289.70 : x
  2. Step 2: Convert to fraction form
    520.37/781.12 = 289.70/x
  3. Step 3: Cross multiply
    520.37x = 781.12 × 289.70
  4. Step 4: Simplify right side
    520.37x = 226,290.46
  5. Step 5: Solve for x
    x = 226,290.46/520.37
  6. Step 6: Final answer
    x = 434.86

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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.