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Finding the Fourth Proportional to 890.73, 1,333.40 and 612.49

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Solution

The fourth proportional to 890.73, 1,333.40 and 612.49 is: 916.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.73 : 1,333.40 = 612.49 : x
  2. Step 2: Convert to fraction form
    890.73/1,333.40 = 612.49/x
  3. Step 3: Cross multiply
    890.73x = 1,333.40 × 612.49
  4. Step 4: Simplify right side
    890.73x = 816,694.17
  5. Step 5: Solve for x
    x = 816,694.17/890.73
  6. Step 6: Final answer
    x = 916.88

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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.