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Finding the Fourth Proportional to 419.55, 625.91 and 396.87

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Solution

The fourth proportional to 419.55, 625.91 and 396.87 is: 592.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    419.55 : 625.91 = 396.87 : x
  2. Step 2: Convert to fraction form
    419.55/625.91 = 396.87/x
  3. Step 3: Cross multiply
    419.55x = 625.91 × 396.87
  4. Step 4: Simplify right side
    419.55x = 248,404.90
  5. Step 5: Solve for x
    x = 248,404.90/419.55
  6. Step 6: Final answer
    x = 592.07

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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.