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Finding the Fourth Proportional to 137.25, 189.45 and 79.07

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Solution

The fourth proportional to 137.25, 189.45 and 79.07 is: 109.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.25 : 189.45 = 79.07 : x
  2. Step 2: Convert to fraction form
    137.25/189.45 = 79.07/x
  3. Step 3: Cross multiply
    137.25x = 189.45 × 79.07
  4. Step 4: Simplify right side
    137.25x = 14,978.86
  5. Step 5: Solve for x
    x = 14,978.86/137.25
  6. Step 6: Final answer
    x = 109.14

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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.