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Finding the Fourth Proportional to 520.27, 780.40 and 303.69

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Solution

The fourth proportional to 520.27, 780.40 and 303.69 is: 455.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.27 : 780.40 = 303.69 : x
  2. Step 2: Convert to fraction form
    520.27/780.40 = 303.69/x
  3. Step 3: Cross multiply
    520.27x = 780.40 × 303.69
  4. Step 4: Simplify right side
    520.27x = 236,999.68
  5. Step 5: Solve for x
    x = 236,999.68/520.27
  6. Step 6: Final answer
    x = 455.54

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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.