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Finding the Fourth Proportional to 171.30, 235.95 and 155.51

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Solution

The fourth proportional to 171.30, 235.95 and 155.51 is: 214.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    171.30 : 235.95 = 155.51 : x
  2. Step 2: Convert to fraction form
    171.30/235.95 = 155.51/x
  3. Step 3: Cross multiply
    171.30x = 235.95 × 155.51
  4. Step 4: Simplify right side
    171.30x = 36,691.40
  5. Step 5: Solve for x
    x = 36,691.40/171.30
  6. Step 6: Final answer
    x = 214.19

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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.