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Finding the Fourth Proportional to 418.55, 624.42 and 395.87

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Solution

The fourth proportional to 418.55, 624.42 and 395.87 is: 590.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.55 : 624.42 = 395.87 : x
  2. Step 2: Convert to fraction form
    418.55/624.42 = 395.87/x
  3. Step 3: Cross multiply
    418.55x = 624.42 × 395.87
  4. Step 4: Simplify right side
    418.55x = 247,186.02
  5. Step 5: Solve for x
    x = 247,186.02/418.55
  6. Step 6: Final answer
    x = 590.58

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.