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Finding the Fourth Proportional to 889.38, 1,219.86 and 821.34

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Solution

The fourth proportional to 889.38, 1,219.86 and 821.34 is: 1,126.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.38 : 1,219.86 = 821.34 : x
  2. Step 2: Convert to fraction form
    889.38/1,219.86 = 821.34/x
  3. Step 3: Cross multiply
    889.38x = 1,219.86 × 821.34
  4. Step 4: Simplify right side
    889.38x = 1,001,919.81
  5. Step 5: Solve for x
    x = 1,001,919.81/889.38
  6. Step 6: Final answer
    x = 1,126.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.