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Finding the Fourth Proportional to 618.86, 928.44 and 436.61

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Solution

The fourth proportional to 618.86, 928.44 and 436.61 is: 655.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.86 : 928.44 = 436.61 : x
  2. Step 2: Convert to fraction form
    618.86/928.44 = 436.61/x
  3. Step 3: Cross multiply
    618.86x = 928.44 × 436.61
  4. Step 4: Simplify right side
    618.86x = 405,359.36
  5. Step 5: Solve for x
    x = 405,359.36/618.86
  6. Step 6: Final answer
    x = 655.02

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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.