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Finding the Fourth Proportional to 642.90, 963.09 and 533.52

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Solution

The fourth proportional to 642.90, 963.09 and 533.52 is: 799.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.90 : 963.09 = 533.52 : x
  2. Step 2: Convert to fraction form
    642.90/963.09 = 533.52/x
  3. Step 3: Cross multiply
    642.90x = 963.09 × 533.52
  4. Step 4: Simplify right side
    642.90x = 513,827.78
  5. Step 5: Solve for x
    x = 513,827.78/642.90
  6. Step 6: Final answer
    x = 799.23

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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.