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Finding the Fourth Proportional to 369.15, 553.34 and 137.89

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Solution

The fourth proportional to 369.15, 553.34 and 137.89 is: 206.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.15 : 553.34 = 137.89 : x
  2. Step 2: Convert to fraction form
    369.15/553.34 = 137.89/x
  3. Step 3: Cross multiply
    369.15x = 553.34 × 137.89
  4. Step 4: Simplify right side
    369.15x = 76,301.09
  5. Step 5: Solve for x
    x = 76,301.09/369.15
  6. Step 6: Final answer
    x = 206.70

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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.