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Finding the Fourth Proportional to 642.98, 964.46 and 156.02

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Solution

The fourth proportional to 642.98, 964.46 and 156.02 is: 234.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.98 : 964.46 = 156.02 : x
  2. Step 2: Convert to fraction form
    642.98/964.46 = 156.02/x
  3. Step 3: Cross multiply
    642.98x = 964.46 × 156.02
  4. Step 4: Simplify right side
    642.98x = 150,470.62
  5. Step 5: Solve for x
    x = 150,470.62/642.98
  6. Step 6: Final answer
    x = 234.02

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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.