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Finding the Fourth Proportional to 194.87, 268.98 and 139.64

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Solution

The fourth proportional to 194.87, 268.98 and 139.64 is: 192.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    194.87 : 268.98 = 139.64 : x
  2. Step 2: Convert to fraction form
    194.87/268.98 = 139.64/x
  3. Step 3: Cross multiply
    194.87x = 268.98 × 139.64
  4. Step 4: Simplify right side
    194.87x = 37,559.02
  5. Step 5: Solve for x
    x = 37,559.02/194.87
  6. Step 6: Final answer
    x = 192.74

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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.