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Finding the Fourth Proportional to 1,561.67, 2,154.66 and 889.49

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Solution

The fourth proportional to 1,561.67, 2,154.66 and 889.49 is: 1,227.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.67 : 2,154.66 = 889.49 : x
  2. Step 2: Convert to fraction form
    1,561.67/2,154.66 = 889.49/x
  3. Step 3: Cross multiply
    1,561.67x = 2,154.66 × 889.49
  4. Step 4: Simplify right side
    1,561.67x = 1,916,548.52
  5. Step 5: Solve for x
    x = 1,916,548.52/1,561.67
  6. Step 6: Final answer
    x = 1,227.24

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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.