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Finding the Fourth Proportional to 343.67, 515.51 and 87.17

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Solution

The fourth proportional to 343.67, 515.51 and 87.17 is: 130.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.67 : 515.51 = 87.17 : x
  2. Step 2: Convert to fraction form
    343.67/515.51 = 87.17/x
  3. Step 3: Cross multiply
    343.67x = 515.51 × 87.17
  4. Step 4: Simplify right side
    343.67x = 44,933.99
  5. Step 5: Solve for x
    x = 44,933.99/343.67
  6. Step 6: Final answer
    x = 130.75

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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.