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Finding the Fourth Proportional to 628.28, 942.69 and 339.92

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Solution

The fourth proportional to 628.28, 942.69 and 339.92 is: 510.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.28 : 942.69 = 339.92 : x
  2. Step 2: Convert to fraction form
    628.28/942.69 = 339.92/x
  3. Step 3: Cross multiply
    628.28x = 942.69 × 339.92
  4. Step 4: Simplify right side
    628.28x = 320,439.18
  5. Step 5: Solve for x
    x = 320,439.18/628.28
  6. Step 6: Final answer
    x = 510.03

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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.