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Finding the Fourth Proportional to 520.19, 780.60 and 382.89

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Solution

The fourth proportional to 520.19, 780.60 and 382.89 is: 574.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.19 : 780.60 = 382.89 : x
  2. Step 2: Convert to fraction form
    520.19/780.60 = 382.89/x
  3. Step 3: Cross multiply
    520.19x = 780.60 × 382.89
  4. Step 4: Simplify right side
    520.19x = 298,883.93
  5. Step 5: Solve for x
    x = 298,883.93/520.19
  6. Step 6: Final answer
    x = 574.57

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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.