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Finding the Fourth Proportional to 643.84, 964.08 and 540.88

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Solution

The fourth proportional to 643.84, 964.08 and 540.88 is: 809.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.84 : 964.08 = 540.88 : x
  2. Step 2: Convert to fraction form
    643.84/964.08 = 540.88/x
  3. Step 3: Cross multiply
    643.84x = 964.08 × 540.88
  4. Step 4: Simplify right side
    643.84x = 521,451.59
  5. Step 5: Solve for x
    x = 521,451.59/643.84
  6. Step 6: Final answer
    x = 809.91

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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.