Home / 20,988.18-28,969.38-12,040.38

Finding the Fourth Proportional to 20,988.18, 28,969.38 and 12,040.38

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Solution

The fourth proportional to 20,988.18, 28,969.38 and 12,040.38 is: 16,618.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,988.18 : 28,969.38 = 12,040.38 : x
  2. Step 2: Convert to fraction form
    20,988.18/28,969.38 = 12,040.38/x
  3. Step 3: Cross multiply
    20,988.18x = 28,969.38 × 12,040.38
  4. Step 4: Simplify right side
    20,988.18x = 348,802,343.56
  5. Step 5: Solve for x
    x = 348,802,343.56/20,988.18
  6. Step 6: Final answer
    x = 16,618.99

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1.5x scale

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.