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Finding the Fourth Proportional to 343.85, 515.87 and 100.40

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Solution

The fourth proportional to 343.85, 515.87 and 100.40 is: 150.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    343.85 : 515.87 = 100.40 : x
  2. Step 2: Convert to fraction form
    343.85/515.87 = 100.40/x
  3. Step 3: Cross multiply
    343.85x = 515.87 × 100.40
  4. Step 4: Simplify right side
    343.85x = 51,793.35
  5. Step 5: Solve for x
    x = 51,793.35/343.85
  6. Step 6: Final answer
    x = 150.63

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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.