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Finding the Fourth Proportional to 157.86, 236.78 and 49.72

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Solution

The fourth proportional to 157.86, 236.78 and 49.72 is: 74.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.86 : 236.78 = 49.72 : x
  2. Step 2: Convert to fraction form
    157.86/236.78 = 49.72/x
  3. Step 3: Cross multiply
    157.86x = 236.78 × 49.72
  4. Step 4: Simplify right side
    157.86x = 11,772.70
  5. Step 5: Solve for x
    x = 11,772.70/157.86
  6. Step 6: Final answer
    x = 74.58

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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.