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Finding the Fourth Proportional to 516.61, 775.43 and 402.30

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Solution

The fourth proportional to 516.61, 775.43 and 402.30 is: 603.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    516.61 : 775.43 = 402.30 : x
  2. Step 2: Convert to fraction form
    516.61/775.43 = 402.30/x
  3. Step 3: Cross multiply
    516.61x = 775.43 × 402.30
  4. Step 4: Simplify right side
    516.61x = 311,956.04
  5. Step 5: Solve for x
    x = 311,956.04/516.61
  6. Step 6: Final answer
    x = 603.85

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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.