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Finding the Fourth Proportional to 137.52, 206.40 and 121.50

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Solution

The fourth proportional to 137.52, 206.40 and 121.50 is: 182.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.52 : 206.40 = 121.50 : x
  2. Step 2: Convert to fraction form
    137.52/206.40 = 121.50/x
  3. Step 3: Cross multiply
    137.52x = 206.40 × 121.50
  4. Step 4: Simplify right side
    137.52x = 25,077.37
  5. Step 5: Solve for x
    x = 25,077.37/137.52
  6. Step 6: Final answer
    x = 182.35

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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.