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Finding the Fourth Proportional to 201.61, 278.01 and 154.99

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Solution

The fourth proportional to 201.61, 278.01 and 154.99 is: 213.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    201.61 : 278.01 = 154.99 : x
  2. Step 2: Convert to fraction form
    201.61/278.01 = 154.99/x
  3. Step 3: Cross multiply
    201.61x = 278.01 × 154.99
  4. Step 4: Simplify right side
    201.61x = 43,088.77
  5. Step 5: Solve for x
    x = 43,088.77/201.61
  6. Step 6: Final answer
    x = 213.72

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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.