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Finding the Fourth Proportional to 199.55, 275.45 and 125.91

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Solution

The fourth proportional to 199.55, 275.45 and 125.91 is: 173.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    199.55 : 275.45 = 125.91 : x
  2. Step 2: Convert to fraction form
    199.55/275.45 = 125.91/x
  3. Step 3: Cross multiply
    199.55x = 275.45 × 125.91
  4. Step 4: Simplify right side
    199.55x = 34,681.28
  5. Step 5: Solve for x
    x = 34,681.28/199.55
  6. Step 6: Final answer
    x = 173.80

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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.