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Finding the Fourth Proportional to 157.40, 235.92 and 85.28

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Solution

The fourth proportional to 157.40, 235.92 and 85.28 is: 127.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    157.40 : 235.92 = 85.28 : x
  2. Step 2: Convert to fraction form
    157.40/235.92 = 85.28/x
  3. Step 3: Cross multiply
    157.40x = 235.92 × 85.28
  4. Step 4: Simplify right side
    157.40x = 20,119.26
  5. Step 5: Solve for x
    x = 20,119.26/157.40
  6. Step 6: Final answer
    x = 127.82

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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.