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Finding the Fourth Proportional to 643.68, 962.40 and 553.44

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Solution

The fourth proportional to 643.68, 962.40 and 553.44 is: 827.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.68 : 962.40 = 553.44 : x
  2. Step 2: Convert to fraction form
    643.68/962.40 = 553.44/x
  3. Step 3: Cross multiply
    643.68x = 962.40 × 553.44
  4. Step 4: Simplify right side
    643.68x = 532,630.66
  5. Step 5: Solve for x
    x = 532,630.66/643.68
  6. Step 6: Final answer
    x = 827.48

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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.