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Finding the Fourth Proportional to 889.56, 1,221.06 and 811.80

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Solution

The fourth proportional to 889.56, 1,221.06 and 811.80 is: 1,114.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    889.56 : 1,221.06 = 811.80 : x
  2. Step 2: Convert to fraction form
    889.56/1,221.06 = 811.80/x
  3. Step 3: Cross multiply
    889.56x = 1,221.06 × 811.80
  4. Step 4: Simplify right side
    889.56x = 991,256.51
  5. Step 5: Solve for x
    x = 991,256.51/889.56
  6. Step 6: Final answer
    x = 1,114.32

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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.