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Finding the Fourth Proportional to 613.95, 919.91 and 431.02

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Solution

The fourth proportional to 613.95, 919.91 and 431.02 is: 645.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.95 : 919.91 = 431.02 : x
  2. Step 2: Convert to fraction form
    613.95/919.91 = 431.02/x
  3. Step 3: Cross multiply
    613.95x = 919.91 × 431.02
  4. Step 4: Simplify right side
    613.95x = 396,499.41
  5. Step 5: Solve for x
    x = 396,499.41/613.95
  6. Step 6: Final answer
    x = 645.81

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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.