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Finding the Fourth Proportional to 643.28, 966.60 and 369.50

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Solution

The fourth proportional to 643.28, 966.60 and 369.50 is: 555.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.28 : 966.60 = 369.50 : x
  2. Step 2: Convert to fraction form
    643.28/966.60 = 369.50/x
  3. Step 3: Cross multiply
    643.28x = 966.60 × 369.50
  4. Step 4: Simplify right side
    643.28x = 357,153.87
  5. Step 5: Solve for x
    x = 357,153.87/643.28
  6. Step 6: Final answer
    x = 555.21

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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.