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Finding the Fourth Proportional to 157.95, 236.90 and 76.74

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Solution

The fourth proportional to 157.95, 236.90 and 76.74 is: 115.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.95 : 236.90 = 76.74 : x
  2. Step 2: Convert to fraction form
    157.95/236.90 = 76.74/x
  3. Step 3: Cross multiply
    157.95x = 236.90 × 76.74
  4. Step 4: Simplify right side
    157.95x = 18,179.32
  5. Step 5: Solve for x
    x = 18,179.32/157.95
  6. Step 6: Final answer
    x = 115.10

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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.