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Finding the Fourth Proportional to 157.89, 236.81 and 66.58

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Solution

The fourth proportional to 157.89, 236.81 and 66.58 is: 99.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.89 : 236.81 = 66.58 : x
  2. Step 2: Convert to fraction form
    157.89/236.81 = 66.58/x
  3. Step 3: Cross multiply
    157.89x = 236.81 × 66.58
  4. Step 4: Simplify right side
    157.89x = 15,766.81
  5. Step 5: Solve for x
    x = 15,766.81/157.89
  6. Step 6: Final answer
    x = 99.86

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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.