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Finding the Fourth Proportional to 643.60, 964.61 and 277.98

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Solution

The fourth proportional to 643.60, 964.61 and 277.98 is: 416.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.60 : 964.61 = 277.98 : x
  2. Step 2: Convert to fraction form
    643.60/964.61 = 277.98/x
  3. Step 3: Cross multiply
    643.60x = 964.61 × 277.98
  4. Step 4: Simplify right side
    643.60x = 268,142.29
  5. Step 5: Solve for x
    x = 268,142.29/643.60
  6. Step 6: Final answer
    x = 416.63

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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.