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Finding the Fourth Proportional to 137.48, 189.74 and 79.26

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Solution

The fourth proportional to 137.48, 189.74 and 79.26 is: 109.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.48 : 189.74 = 79.26 : x
  2. Step 2: Convert to fraction form
    137.48/189.74 = 79.26/x
  3. Step 3: Cross multiply
    137.48x = 189.74 × 79.26
  4. Step 4: Simplify right side
    137.48x = 15,038.79
  5. Step 5: Solve for x
    x = 15,038.79/137.48
  6. Step 6: Final answer
    x = 109.39

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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.