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Finding the Fourth Proportional to 418.55, 627.85 and 129.98

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Solution

The fourth proportional to 418.55, 627.85 and 129.98 is: 194.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.55 : 627.85 = 129.98 : x
  2. Step 2: Convert to fraction form
    418.55/627.85 = 129.98/x
  3. Step 3: Cross multiply
    418.55x = 627.85 × 129.98
  4. Step 4: Simplify right side
    418.55x = 81,607.94
  5. Step 5: Solve for x
    x = 81,607.94/418.55
  6. Step 6: Final answer
    x = 194.98

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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.