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Finding the Fourth Proportional to 1,561.68, 2,155 and 940.56

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Solution

The fourth proportional to 1,561.68, 2,155 and 940.56 is: 1,297.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.68 : 2,155 = 940.56 : x
  2. Step 2: Convert to fraction form
    1,561.68/2,155 = 940.56/x
  3. Step 3: Cross multiply
    1,561.68x = 2,155 × 940.56
  4. Step 4: Simplify right side
    1,561.68x = 2,026,906.80
  5. Step 5: Solve for x
    x = 2,026,906.80/1,561.68
  6. Step 6: Final answer
    x = 1,297.90

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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.