Home / 1,423.20-2,129.43-1,279.32

Finding the Fourth Proportional to 1,423.20, 2,129.43 and 1,279.32

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Solution

The fourth proportional to 1,423.20, 2,129.43 and 1,279.32 is: 1,914.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,423.20 : 2,129.43 = 1,279.32 : x
  2. Step 2: Convert to fraction form
    1,423.20/2,129.43 = 1,279.32/x
  3. Step 3: Cross multiply
    1,423.20x = 2,129.43 × 1,279.32
  4. Step 4: Simplify right side
    1,423.20x = 2,724,222.39
  5. Step 5: Solve for x
    x = 2,724,222.39/1,423.20
  6. Step 6: Final answer
    x = 1,914.15

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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.