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Finding the Fourth Proportional to 171.86, 257.54 and 90.53

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Solution

The fourth proportional to 171.86, 257.54 and 90.53 is: 135.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.86 : 257.54 = 90.53 : x
  2. Step 2: Convert to fraction form
    171.86/257.54 = 90.53/x
  3. Step 3: Cross multiply
    171.86x = 257.54 × 90.53
  4. Step 4: Simplify right side
    171.86x = 23,313.36
  5. Step 5: Solve for x
    x = 23,313.36/171.86
  6. Step 6: Final answer
    x = 135.66

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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.