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Finding the Fourth Proportional to 890.05, 1,333.05 and 428.17

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Solution

The fourth proportional to 890.05, 1,333.05 and 428.17 is: 641.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.05 : 1,333.05 = 428.17 : x
  2. Step 2: Convert to fraction form
    890.05/1,333.05 = 428.17/x
  3. Step 3: Cross multiply
    890.05x = 1,333.05 × 428.17
  4. Step 4: Simplify right side
    890.05x = 570,772.02
  5. Step 5: Solve for x
    x = 570,772.02/890.05
  6. Step 6: Final answer
    x = 641.28

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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.