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Finding the Fourth Proportional to 154.95, 213.83 and 85.01

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Solution

The fourth proportional to 154.95, 213.83 and 85.01 is: 117.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.95 : 213.83 = 85.01 : x
  2. Step 2: Convert to fraction form
    154.95/213.83 = 85.01/x
  3. Step 3: Cross multiply
    154.95x = 213.83 × 85.01
  4. Step 4: Simplify right side
    154.95x = 18,177.00
  5. Step 5: Solve for x
    x = 18,177.00/154.95
  6. Step 6: Final answer
    x = 117.31

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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.