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Finding the Fourth Proportional to 369.45, 553.45 and 287.91

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Solution

The fourth proportional to 369.45, 553.45 and 287.91 is: 431.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.45 : 553.45 = 287.91 : x
  2. Step 2: Convert to fraction form
    369.45/553.45 = 287.91/x
  3. Step 3: Cross multiply
    369.45x = 553.45 × 287.91
  4. Step 4: Simplify right side
    369.45x = 159,340.30
  5. Step 5: Solve for x
    x = 159,340.30/369.45
  6. Step 6: Final answer
    x = 431.30

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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.