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Finding the Fourth Proportional to 157.95, 236.80 and 55.21

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Solution

The fourth proportional to 157.95, 236.80 and 55.21 is: 82.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.95 : 236.80 = 55.21 : x
  2. Step 2: Convert to fraction form
    157.95/236.80 = 55.21/x
  3. Step 3: Cross multiply
    157.95x = 236.80 × 55.21
  4. Step 4: Simplify right side
    157.95x = 13,073.73
  5. Step 5: Solve for x
    x = 13,073.73/157.95
  6. Step 6: Final answer
    x = 82.77

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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.