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Finding the Fourth Proportional to 418.55, 578.05 and 372.74

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Solution

The fourth proportional to 418.55, 578.05 and 372.74 is: 514.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.55 : 578.05 = 372.74 : x
  2. Step 2: Convert to fraction form
    418.55/578.05 = 372.74/x
  3. Step 3: Cross multiply
    418.55x = 578.05 × 372.74
  4. Step 4: Simplify right side
    418.55x = 215,462.36
  5. Step 5: Solve for x
    x = 215,462.36/418.55
  6. Step 6: Final answer
    x = 514.78

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.