Home / 1,531.06-2,112.11-999.70

Finding the Fourth Proportional to 1,531.06, 2,112.11 and 999.70

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Solution

The fourth proportional to 1,531.06, 2,112.11 and 999.70 is: 1,379.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,531.06 : 2,112.11 = 999.70 : x
  2. Step 2: Convert to fraction form
    1,531.06/2,112.11 = 999.70/x
  3. Step 3: Cross multiply
    1,531.06x = 2,112.11 × 999.70
  4. Step 4: Simplify right side
    1,531.06x = 2,111,469.84
  5. Step 5: Solve for x
    x = 2,111,469.84/1,531.06
  6. Step 6: Final answer
    x = 1,379.09

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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.