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Finding the Fourth Proportional to 157.71, 236.36 and 84.57

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Solution

The fourth proportional to 157.71, 236.36 and 84.57 is: 126.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.71 : 236.36 = 84.57 : x
  2. Step 2: Convert to fraction form
    157.71/236.36 = 84.57/x
  3. Step 3: Cross multiply
    157.71x = 236.36 × 84.57
  4. Step 4: Simplify right side
    157.71x = 19,988.54
  5. Step 5: Solve for x
    x = 19,988.54/157.71
  6. Step 6: Final answer
    x = 126.74

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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.