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Finding the Fourth Proportional to 154.60, 231.86 and 90.34

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Solution

The fourth proportional to 154.60, 231.86 and 90.34 is: 135.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.60 : 231.86 = 90.34 : x
  2. Step 2: Convert to fraction form
    154.60/231.86 = 90.34/x
  3. Step 3: Cross multiply
    154.60x = 231.86 × 90.34
  4. Step 4: Simplify right side
    154.60x = 20,946.23
  5. Step 5: Solve for x
    x = 20,946.23/154.60
  6. Step 6: Final answer
    x = 135.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.