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Finding the Fourth Proportional to 343.79, 515.67 and 87.29

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Solution

The fourth proportional to 343.79, 515.67 and 87.29 is: 130.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.79 : 515.67 = 87.29 : x
  2. Step 2: Convert to fraction form
    343.79/515.67 = 87.29/x
  3. Step 3: Cross multiply
    343.79x = 515.67 × 87.29
  4. Step 4: Simplify right side
    343.79x = 45,010.26
  5. Step 5: Solve for x
    x = 45,010.26/343.79
  6. Step 6: Final answer
    x = 130.93

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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.