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Finding the Fourth Proportional to 1,561.21, 2,154.50 and 862.54

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Solution

The fourth proportional to 1,561.21, 2,154.50 and 862.54 is: 1,190.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.21 : 2,154.50 = 862.54 : x
  2. Step 2: Convert to fraction form
    1,561.21/2,154.50 = 862.54/x
  3. Step 3: Cross multiply
    1,561.21x = 2,154.50 × 862.54
  4. Step 4: Simplify right side
    1,561.21x = 1,858,342.43
  5. Step 5: Solve for x
    x = 1,858,342.43/1,561.21
  6. Step 6: Final answer
    x = 1,190.32

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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.