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Finding the Fourth Proportional to 342.28, 513.40 and 126

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Solution

The fourth proportional to 342.28, 513.40 and 126 is: 188.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.28 : 513.40 = 126 : x
  2. Step 2: Convert to fraction form
    342.28/513.40 = 126/x
  3. Step 3: Cross multiply
    342.28x = 513.40 × 126
  4. Step 4: Simplify right side
    342.28x = 64,688.40
  5. Step 5: Solve for x
    x = 64,688.40/342.28
  6. Step 6: Final answer
    x = 188.99

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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.