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Finding the Fourth Proportional to 618.21, 925.70 and 434.61

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Solution

The fourth proportional to 618.21, 925.70 and 434.61 is: 650.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.21 : 925.70 = 434.61 : x
  2. Step 2: Convert to fraction form
    618.21/925.70 = 434.61/x
  3. Step 3: Cross multiply
    618.21x = 925.70 × 434.61
  4. Step 4: Simplify right side
    618.21x = 402,316.30
  5. Step 5: Solve for x
    x = 402,316.30/618.21
  6. Step 6: Final answer
    x = 650.78

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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.