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Finding the Fourth Proportional to 170.78, 235.68 and 93.16

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Solution

The fourth proportional to 170.78, 235.68 and 93.16 is: 128.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    170.78 : 235.68 = 93.16 : x
  2. Step 2: Convert to fraction form
    170.78/235.68 = 93.16/x
  3. Step 3: Cross multiply
    170.78x = 235.68 × 93.16
  4. Step 4: Simplify right side
    170.78x = 21,955.36
  5. Step 5: Solve for x
    x = 21,955.36/170.78
  6. Step 6: Final answer
    x = 128.56

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.