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Finding the Fourth Proportional to 618.61, 928.06 and 436.36

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Solution

The fourth proportional to 618.61, 928.06 and 436.36 is: 654.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.61 : 928.06 = 436.36 : x
  2. Step 2: Convert to fraction form
    618.61/928.06 = 436.36/x
  3. Step 3: Cross multiply
    618.61x = 928.06 × 436.36
  4. Step 4: Simplify right side
    618.61x = 404,963.62
  5. Step 5: Solve for x
    x = 404,963.62/618.61
  6. Step 6: Final answer
    x = 654.64

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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.