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Finding the Fourth Proportional to 342.02, 512.78 and 125.56

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Solution

The fourth proportional to 342.02, 512.78 and 125.56 is: 188.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    342.02 : 512.78 = 125.56 : x
  2. Step 2: Convert to fraction form
    342.02/512.78 = 125.56/x
  3. Step 3: Cross multiply
    342.02x = 512.78 × 125.56
  4. Step 4: Simplify right side
    342.02x = 64,384.66
  5. Step 5: Solve for x
    x = 64,384.66/342.02
  6. Step 6: Final answer
    x = 188.25

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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.