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Finding the Fourth Proportional to 890.75, 1,226.52 and 789.72

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Solution

The fourth proportional to 890.75, 1,226.52 and 789.72 is: 1,087.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.75 : 1,226.52 = 789.72 : x
  2. Step 2: Convert to fraction form
    890.75/1,226.52 = 789.72/x
  3. Step 3: Cross multiply
    890.75x = 1,226.52 × 789.72
  4. Step 4: Simplify right side
    890.75x = 968,607.37
  5. Step 5: Solve for x
    x = 968,607.37/890.75
  6. Step 6: Final answer
    x = 1,087.41

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Half scale
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Double scale
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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.