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Finding the Fourth Proportional to 1,561.26, 2,154.54 and 862.68

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Solution

The fourth proportional to 1,561.26, 2,154.54 and 862.68 is: 1,190.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.26 : 2,154.54 = 862.68 : x
  2. Step 2: Convert to fraction form
    1,561.26/2,154.54 = 862.68/x
  3. Step 3: Cross multiply
    1,561.26x = 2,154.54 × 862.68
  4. Step 4: Simplify right side
    1,561.26x = 1,858,678.57
  5. Step 5: Solve for x
    x = 1,858,678.57/1,561.26
  6. Step 6: Final answer
    x = 1,190.50

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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.