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Finding the Fourth Proportional to 618.96, 928.40 and 445.93

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Solution

The fourth proportional to 618.96, 928.40 and 445.93 is: 668.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.96 : 928.40 = 445.93 : x
  2. Step 2: Convert to fraction form
    618.96/928.40 = 445.93/x
  3. Step 3: Cross multiply
    618.96x = 928.40 × 445.93
  4. Step 4: Simplify right side
    618.96x = 413,999.47
  5. Step 5: Solve for x
    x = 413,999.47/618.96
  6. Step 6: Final answer
    x = 668.87

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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.