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Finding the Fourth Proportional to 1,406.10, 2,109.15 and 626.48

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Solution

The fourth proportional to 1,406.10, 2,109.15 and 626.48 is: 939.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,406.10 : 2,109.15 = 626.48 : x
  2. Step 2: Convert to fraction form
    1,406.10/2,109.15 = 626.48/x
  3. Step 3: Cross multiply
    1,406.10x = 2,109.15 × 626.48
  4. Step 4: Simplify right side
    1,406.10x = 1,321,329.75
  5. Step 5: Solve for x
    x = 1,321,329.75/1,406.10
  6. Step 6: Final answer
    x = 939.71

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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.