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Finding the Fourth Proportional to 890.32, 1,229.88 and 670.96

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Solution

The fourth proportional to 890.32, 1,229.88 and 670.96 is: 926.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.32 : 1,229.88 = 670.96 : x
  2. Step 2: Convert to fraction form
    890.32/1,229.88 = 670.96/x
  3. Step 3: Cross multiply
    890.32x = 1,229.88 × 670.96
  4. Step 4: Simplify right side
    890.32x = 825,200.28
  5. Step 5: Solve for x
    x = 825,200.28/890.32
  6. Step 6: Final answer
    x = 926.86

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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.