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Finding the Fourth Proportional to 889.70, 1,333.96 and 427.46

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Solution

The fourth proportional to 889.70, 1,333.96 and 427.46 is: 640.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.70 : 1,333.96 = 427.46 : x
  2. Step 2: Convert to fraction form
    889.70/1,333.96 = 427.46/x
  3. Step 3: Cross multiply
    889.70x = 1,333.96 × 427.46
  4. Step 4: Simplify right side
    889.70x = 570,214.54
  5. Step 5: Solve for x
    x = 570,214.54/889.70
  6. Step 6: Final answer
    x = 640.91

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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.