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Finding the Fourth Proportional to 890.86, 1,229.82 and 611.60

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Solution

The fourth proportional to 890.86, 1,229.82 and 611.60 is: 844.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.86 : 1,229.82 = 611.60 : x
  2. Step 2: Convert to fraction form
    890.86/1,229.82 = 611.60/x
  3. Step 3: Cross multiply
    890.86x = 1,229.82 × 611.60
  4. Step 4: Simplify right side
    890.86x = 752,157.91
  5. Step 5: Solve for x
    x = 752,157.91/890.86
  6. Step 6: Final answer
    x = 844.31

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.