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Finding the Fourth Proportional to 618.28, 926.39 and 434.79

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Solution

The fourth proportional to 618.28, 926.39 and 434.79 is: 651.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.28 : 926.39 = 434.79 : x
  2. Step 2: Convert to fraction form
    618.28/926.39 = 434.79/x
  3. Step 3: Cross multiply
    618.28x = 926.39 × 434.79
  4. Step 4: Simplify right side
    618.28x = 402,786.20
  5. Step 5: Solve for x
    x = 402,786.20/618.28
  6. Step 6: Final answer
    x = 651.47

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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.