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Finding the Fourth Proportional to 890.57, 1,337.79 and 861.41

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Solution

The fourth proportional to 890.57, 1,337.79 and 861.41 is: 1,293.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.57 : 1,337.79 = 861.41 : x
  2. Step 2: Convert to fraction form
    890.57/1,337.79 = 861.41/x
  3. Step 3: Cross multiply
    890.57x = 1,337.79 × 861.41
  4. Step 4: Simplify right side
    890.57x = 1,152,385.68
  5. Step 5: Solve for x
    x = 1,152,385.68/890.57
  6. Step 6: Final answer
    x = 1,293.99

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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.