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Finding the Fourth Proportional to 643.98, 965.98 and 157.03

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Solution

The fourth proportional to 643.98, 965.98 and 157.03 is: 235.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.98 : 965.98 = 157.03 : x
  2. Step 2: Convert to fraction form
    643.98/965.98 = 157.03/x
  3. Step 3: Cross multiply
    643.98x = 965.98 × 157.03
  4. Step 4: Simplify right side
    643.98x = 151,690.17
  5. Step 5: Solve for x
    x = 151,690.17/643.98
  6. Step 6: Final answer
    x = 235.55

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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.