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Finding the Fourth Proportional to 1,409.14, 2,109.03 and 858.61

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Solution

The fourth proportional to 1,409.14, 2,109.03 and 858.61 is: 1,285.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,409.14 : 2,109.03 = 858.61 : x
  2. Step 2: Convert to fraction form
    1,409.14/2,109.03 = 858.61/x
  3. Step 3: Cross multiply
    1,409.14x = 2,109.03 × 858.61
  4. Step 4: Simplify right side
    1,409.14x = 1,810,834.25
  5. Step 5: Solve for x
    x = 1,810,834.25/1,409.14
  6. Step 6: Final answer
    x = 1,285.06

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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.