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Finding the Fourth Proportional to 157.76, 236.72 and 85.52

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Solution

The fourth proportional to 157.76, 236.72 and 85.52 is: 128.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.76 : 236.72 = 85.52 : x
  2. Step 2: Convert to fraction form
    157.76/236.72 = 85.52/x
  3. Step 3: Cross multiply
    157.76x = 236.72 × 85.52
  4. Step 4: Simplify right side
    157.76x = 20,244.29
  5. Step 5: Solve for x
    x = 20,244.29/157.76
  6. Step 6: Final answer
    x = 128.32

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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.