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Finding the Fourth Proportional to 225.18, 310.78 and 137.89

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Solution

The fourth proportional to 225.18, 310.78 and 137.89 is: 190.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    225.18 : 310.78 = 137.89 : x
  2. Step 2: Convert to fraction form
    225.18/310.78 = 137.89/x
  3. Step 3: Cross multiply
    225.18x = 310.78 × 137.89
  4. Step 4: Simplify right side
    225.18x = 42,853.45
  5. Step 5: Solve for x
    x = 42,853.45/225.18
  6. Step 6: Final answer
    x = 190.31

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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.