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Finding the Fourth Proportional to 618.24, 928 and 425.28

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Solution

The fourth proportional to 618.24, 928 and 425.28 is: 638.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.24 : 928 = 425.28 : x
  2. Step 2: Convert to fraction form
    618.24/928 = 425.28/x
  3. Step 3: Cross multiply
    618.24x = 928 × 425.28
  4. Step 4: Simplify right side
    618.24x = 394,659.84
  5. Step 5: Solve for x
    x = 394,659.84/618.24
  6. Step 6: Final answer
    x = 638.36

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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.