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Finding the Fourth Proportional to 137.58, 189.72 and 113.28

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Solution

The fourth proportional to 137.58, 189.72 and 113.28 is: 156.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.58 : 189.72 = 113.28 : x
  2. Step 2: Convert to fraction form
    137.58/189.72 = 113.28/x
  3. Step 3: Cross multiply
    137.58x = 189.72 × 113.28
  4. Step 4: Simplify right side
    137.58x = 21,491.48
  5. Step 5: Solve for x
    x = 21,491.48/137.58
  6. Step 6: Final answer
    x = 156.21

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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.