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Finding the Fourth Proportional to 137.47, 206.30 and 72.47

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Solution

The fourth proportional to 137.47, 206.30 and 72.47 is: 108.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.47 : 206.30 = 72.47 : x
  2. Step 2: Convert to fraction form
    137.47/206.30 = 72.47/x
  3. Step 3: Cross multiply
    137.47x = 206.30 × 72.47
  4. Step 4: Simplify right side
    137.47x = 14,949.40
  5. Step 5: Solve for x
    x = 14,949.40/137.47
  6. Step 6: Final answer
    x = 108.75

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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.