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Finding the Fourth Proportional to 154.70, 213.46 and 85.70

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Solution

The fourth proportional to 154.70, 213.46 and 85.70 is: 118.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.70 : 213.46 = 85.70 : x
  2. Step 2: Convert to fraction form
    154.70/213.46 = 85.70/x
  3. Step 3: Cross multiply
    154.70x = 213.46 × 85.70
  4. Step 4: Simplify right side
    154.70x = 18,293.52
  5. Step 5: Solve for x
    x = 18,293.52/154.70
  6. Step 6: Final answer
    x = 118.25

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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.