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Finding the Fourth Proportional to 645.84, 966.78 and 439.56

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Solution

The fourth proportional to 645.84, 966.78 and 439.56 is: 657.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.84 : 966.78 = 439.56 : x
  2. Step 2: Convert to fraction form
    645.84/966.78 = 439.56/x
  3. Step 3: Cross multiply
    645.84x = 966.78 × 439.56
  4. Step 4: Simplify right side
    645.84x = 424,957.82
  5. Step 5: Solve for x
    x = 424,957.82/645.84
  6. Step 6: Final answer
    x = 657.99

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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.