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Finding the Fourth Proportional to 291.51, 402.15 and 173.42

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Solution

The fourth proportional to 291.51, 402.15 and 173.42 is: 239.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    291.51 : 402.15 = 173.42 : x
  2. Step 2: Convert to fraction form
    291.51/402.15 = 173.42/x
  3. Step 3: Cross multiply
    291.51x = 402.15 × 173.42
  4. Step 4: Simplify right side
    291.51x = 69,740.85
  5. Step 5: Solve for x
    x = 69,740.85/291.51
  6. Step 6: Final answer
    x = 239.24

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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.