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Finding the Fourth Proportional to 640.53, 960.55 and 380.59

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Solution

The fourth proportional to 640.53, 960.55 and 380.59 is: 570.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.53 : 960.55 = 380.59 : x
  2. Step 2: Convert to fraction form
    640.53/960.55 = 380.59/x
  3. Step 3: Cross multiply
    640.53x = 960.55 × 380.59
  4. Step 4: Simplify right side
    640.53x = 365,575.72
  5. Step 5: Solve for x
    x = 365,575.72/640.53
  6. Step 6: Final answer
    x = 570.74

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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.