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Finding the Fourth Proportional to 171.58, 256.98 and 90.28

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Solution

The fourth proportional to 171.58, 256.98 and 90.28 is: 135.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.58 : 256.98 = 90.28 : x
  2. Step 2: Convert to fraction form
    171.58/256.98 = 90.28/x
  3. Step 3: Cross multiply
    171.58x = 256.98 × 90.28
  4. Step 4: Simplify right side
    171.58x = 23,200.15
  5. Step 5: Solve for x
    x = 23,200.15/171.58
  6. Step 6: Final answer
    x = 135.21

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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.