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Finding the Fourth Proportional to 618.82, 926.80 and 445.68

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Solution

The fourth proportional to 618.82, 926.80 and 445.68 is: 667.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.82 : 926.80 = 445.68 : x
  2. Step 2: Convert to fraction form
    618.82/926.80 = 445.68/x
  3. Step 3: Cross multiply
    618.82x = 926.80 × 445.68
  4. Step 4: Simplify right side
    618.82x = 413,056.22
  5. Step 5: Solve for x
    x = 413,056.22/618.82
  6. Step 6: Final answer
    x = 667.49

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1.5x scale

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.