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Finding the Fourth Proportional to 407.62, 612.58 and 396.42

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Solution

The fourth proportional to 407.62, 612.58 and 396.42 is: 595.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.62 : 612.58 = 396.42 : x
  2. Step 2: Convert to fraction form
    407.62/612.58 = 396.42/x
  3. Step 3: Cross multiply
    407.62x = 612.58 × 396.42
  4. Step 4: Simplify right side
    407.62x = 242,838.96
  5. Step 5: Solve for x
    x = 242,838.96/407.62
  6. Step 6: Final answer
    x = 595.75

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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.