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Finding the Fourth Proportional to 520.84, 780.74 and 289.83

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Solution

The fourth proportional to 520.84, 780.74 and 289.83 is: 434.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.84 : 780.74 = 289.83 : x
  2. Step 2: Convert to fraction form
    520.84/780.74 = 289.83/x
  3. Step 3: Cross multiply
    520.84x = 780.74 × 289.83
  4. Step 4: Simplify right side
    520.84x = 226,286.07
  5. Step 5: Solve for x
    x = 226,286.07/520.84
  6. Step 6: Final answer
    x = 434.46

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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.