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Finding the Fourth Proportional to 137.42, 206.16 and 85.98

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Solution

The fourth proportional to 137.42, 206.16 and 85.98 is: 129.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.42 : 206.16 = 85.98 : x
  2. Step 2: Convert to fraction form
    137.42/206.16 = 85.98/x
  3. Step 3: Cross multiply
    137.42x = 206.16 × 85.98
  4. Step 4: Simplify right side
    137.42x = 17,726.73
  5. Step 5: Solve for x
    x = 17,726.73/137.42
  6. Step 6: Final answer
    x = 129.00

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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.