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Finding the Fourth Proportional to 1,561.12, 2,154.48 and 940

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Solution

The fourth proportional to 1,561.12, 2,154.48 and 940 is: 1,297.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.12 : 2,154.48 = 940 : x
  2. Step 2: Convert to fraction form
    1,561.12/2,154.48 = 940/x
  3. Step 3: Cross multiply
    1,561.12x = 2,154.48 × 940
  4. Step 4: Simplify right side
    1,561.12x = 2,025,211.20
  5. Step 5: Solve for x
    x = 2,025,211.20/1,561.12
  6. Step 6: Final answer
    x = 1,297.28

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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.