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Finding the Fourth Proportional to 520.29, 780.36 and 231.66

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Solution

The fourth proportional to 520.29, 780.36 and 231.66 is: 347.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.29 : 780.36 = 231.66 : x
  2. Step 2: Convert to fraction form
    520.29/780.36 = 231.66/x
  3. Step 3: Cross multiply
    520.29x = 780.36 × 231.66
  4. Step 4: Simplify right side
    520.29x = 180,778.20
  5. Step 5: Solve for x
    x = 180,778.20/520.29
  6. Step 6: Final answer
    x = 347.46

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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.