Home / 13,311.78-19,969.78-4,990.66

Finding the Fourth Proportional to 13,311.78, 19,969.78 and 4,990.66

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Solution

The fourth proportional to 13,311.78, 19,969.78 and 4,990.66 is: 7,486.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,311.78 : 19,969.78 = 4,990.66 : x
  2. Step 2: Convert to fraction form
    13,311.78/19,969.78 = 4,990.66/x
  3. Step 3: Cross multiply
    13,311.78x = 19,969.78 × 4,990.66
  4. Step 4: Simplify right side
    13,311.78x = 99,662,382.25
  5. Step 5: Solve for x
    x = 99,662,382.25/13,311.78
  6. Step 6: Final answer
    x = 7,486.78

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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.