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Finding the Fourth Proportional to 889.42, 1,333.86 and 426.97

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Solution

The fourth proportional to 889.42, 1,333.86 and 426.97 is: 640.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.42 : 1,333.86 = 426.97 : x
  2. Step 2: Convert to fraction form
    889.42/1,333.86 = 426.97/x
  3. Step 3: Cross multiply
    889.42x = 1,333.86 × 426.97
  4. Step 4: Simplify right side
    889.42x = 569,518.20
  5. Step 5: Solve for x
    x = 569,518.20/889.42
  6. Step 6: Final answer
    x = 640.33

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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.