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Finding the Fourth Proportional to 919.41, 1,377.16 and 426.22

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Solution

The fourth proportional to 919.41, 1,377.16 and 426.22 is: 638.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.41 : 1,377.16 = 426.22 : x
  2. Step 2: Convert to fraction form
    919.41/1,377.16 = 426.22/x
  3. Step 3: Cross multiply
    919.41x = 1,377.16 × 426.22
  4. Step 4: Simplify right side
    919.41x = 586,973.14
  5. Step 5: Solve for x
    x = 586,973.14/919.41
  6. Step 6: Final answer
    x = 638.42

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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.