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Finding the Fourth Proportional to 642.95, 964.38 and 231.98

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Solution

The fourth proportional to 642.95, 964.38 and 231.98 is: 347.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.95 : 964.38 = 231.98 : x
  2. Step 2: Convert to fraction form
    642.95/964.38 = 231.98/x
  3. Step 3: Cross multiply
    642.95x = 964.38 × 231.98
  4. Step 4: Simplify right side
    642.95x = 223,719.28
  5. Step 5: Solve for x
    x = 223,719.28/642.95
  6. Step 6: Final answer
    x = 347.96

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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.