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Finding the Fourth Proportional to 1,135.34, 1,568.31 and 889.76

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Solution

The fourth proportional to 1,135.34, 1,568.31 and 889.76 is: 1,229.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,135.34 : 1,568.31 = 889.76 : x
  2. Step 2: Convert to fraction form
    1,135.34/1,568.31 = 889.76/x
  3. Step 3: Cross multiply
    1,135.34x = 1,568.31 × 889.76
  4. Step 4: Simplify right side
    1,135.34x = 1,395,419.51
  5. Step 5: Solve for x
    x = 1,395,419.51/1,135.34
  6. Step 6: Final answer
    x = 1,229.08

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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.