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Finding the Fourth Proportional to 642, 963.12 and 209.04

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Solution

The fourth proportional to 642, 963.12 and 209.04 is: 313.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    642 : 963.12 = 209.04 : x
  2. Step 2: Convert to fraction form
    642/963.12 = 209.04/x
  3. Step 3: Cross multiply
    642x = 963.12 × 209.04
  4. Step 4: Simplify right side
    642x = 201,330.60
  5. Step 5: Solve for x
    x = 201,330.60/642
  6. Step 6: Final answer
    x = 313.60

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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.