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Finding the Fourth Proportional to 890.56, 1,331.90 and 793.72

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Solution

The fourth proportional to 890.56, 1,331.90 and 793.72 is: 1,187.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.56 : 1,331.90 = 793.72 : x
  2. Step 2: Convert to fraction form
    890.56/1,331.90 = 793.72/x
  3. Step 3: Cross multiply
    890.56x = 1,331.90 × 793.72
  4. Step 4: Simplify right side
    890.56x = 1,057,155.67
  5. Step 5: Solve for x
    x = 1,057,155.67/890.56
  6. Step 6: Final answer
    x = 1,187.07

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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.