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Finding the Fourth Proportional to 372.90, 561.60 and 330

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Solution

The fourth proportional to 372.90, 561.60 and 330 is: 496.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.90 : 561.60 = 330 : x
  2. Step 2: Convert to fraction form
    372.90/561.60 = 330/x
  3. Step 3: Cross multiply
    372.90x = 561.60 × 330
  4. Step 4: Simplify right side
    372.90x = 185,328
  5. Step 5: Solve for x
    x = 185,328/372.90
  6. Step 6: Final answer
    x = 496.99

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.