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Finding the Fourth Proportional to 642.99, 964.40 and 295.95

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Solution

The fourth proportional to 642.99, 964.40 and 295.95 is: 443.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.99 : 964.40 = 295.95 : x
  2. Step 2: Convert to fraction form
    642.99/964.40 = 295.95/x
  3. Step 3: Cross multiply
    642.99x = 964.40 × 295.95
  4. Step 4: Simplify right side
    642.99x = 285,412.70
  5. Step 5: Solve for x
    x = 285,412.70/642.99
  6. Step 6: Final answer
    x = 443.88

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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.