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Finding the Fourth Proportional to 642.85, 963.43 and 296.13

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Solution

The fourth proportional to 642.85, 963.43 and 296.13 is: 443.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.85 : 963.43 = 296.13 : x
  2. Step 2: Convert to fraction form
    642.85/963.43 = 296.13/x
  3. Step 3: Cross multiply
    642.85x = 963.43 × 296.13
  4. Step 4: Simplify right side
    642.85x = 285,303.40
  5. Step 5: Solve for x
    x = 285,303.40/642.85
  6. Step 6: Final answer
    x = 443.81

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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.