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Finding the Fourth Proportional to 137.94, 206.80 and 64.83

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Solution

The fourth proportional to 137.94, 206.80 and 64.83 is: 97.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    137.94 : 206.80 = 64.83 : x
  2. Step 2: Convert to fraction form
    137.94/206.80 = 64.83/x
  3. Step 3: Cross multiply
    137.94x = 206.80 × 64.83
  4. Step 4: Simplify right side
    137.94x = 13,407.82
  5. Step 5: Solve for x
    x = 13,407.82/137.94
  6. Step 6: Final answer
    x = 97.20

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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.