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Finding the Fourth Proportional to 618.31, 928.28 and 435.79

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Solution

The fourth proportional to 618.31, 928.28 and 435.79 is: 654.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.31 : 928.28 = 435.79 : x
  2. Step 2: Convert to fraction form
    618.31/928.28 = 435.79/x
  3. Step 3: Cross multiply
    618.31x = 928.28 × 435.79
  4. Step 4: Simplify right side
    618.31x = 404,535.14
  5. Step 5: Solve for x
    x = 404,535.14/618.31
  6. Step 6: Final answer
    x = 654.26

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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.