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Finding the Fourth Proportional to 407.72, 612.18 and 393.54

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Solution

The fourth proportional to 407.72, 612.18 and 393.54 is: 590.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.72 : 612.18 = 393.54 : x
  2. Step 2: Convert to fraction form
    407.72/612.18 = 393.54/x
  3. Step 3: Cross multiply
    407.72x = 612.18 × 393.54
  4. Step 4: Simplify right side
    407.72x = 240,917.32
  5. Step 5: Solve for x
    x = 240,917.32/407.72
  6. Step 6: Final answer
    x = 590.90

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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.