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Finding the Fourth Proportional to 369.15, 553.41 and 318.39

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Solution

The fourth proportional to 369.15, 553.41 and 318.39 is: 477.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    369.15 : 553.41 = 318.39 : x
  2. Step 2: Convert to fraction form
    369.15/553.41 = 318.39/x
  3. Step 3: Cross multiply
    369.15x = 553.41 × 318.39
  4. Step 4: Simplify right side
    369.15x = 176,200.21
  5. Step 5: Solve for x
    x = 176,200.21/369.15
  6. Step 6: Final answer
    x = 477.31

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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.