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Finding the Fourth Proportional to 201.66, 278.13 and 139.59

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Solution

The fourth proportional to 201.66, 278.13 and 139.59 is: 192.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.66 : 278.13 = 139.59 : x
  2. Step 2: Convert to fraction form
    201.66/278.13 = 139.59/x
  3. Step 3: Cross multiply
    201.66x = 278.13 × 139.59
  4. Step 4: Simplify right side
    201.66x = 38,824.17
  5. Step 5: Solve for x
    x = 38,824.17/201.66
  6. Step 6: Final answer
    x = 192.52

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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.