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Finding the Fourth Proportional to 1,561.68, 2,339.42 and 867.24

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Solution

The fourth proportional to 1,561.68, 2,339.42 and 867.24 is: 1,299.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.68 : 2,339.42 = 867.24 : x
  2. Step 2: Convert to fraction form
    1,561.68/2,339.42 = 867.24/x
  3. Step 3: Cross multiply
    1,561.68x = 2,339.42 × 867.24
  4. Step 4: Simplify right side
    1,561.68x = 2,028,834.26
  5. Step 5: Solve for x
    x = 2,028,834.26/1,561.68
  6. Step 6: Final answer
    x = 1,299.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.