Home / 13,903.92-20,836.38-9,990

Finding the Fourth Proportional to 13,903.92, 20,836.38 and 9,990

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Solution

The fourth proportional to 13,903.92, 20,836.38 and 9,990 is: 14,970.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,903.92 : 20,836.38 = 9,990 : x
  2. Step 2: Convert to fraction form
    13,903.92/20,836.38 = 9,990/x
  3. Step 3: Cross multiply
    13,903.92x = 20,836.38 × 9,990
  4. Step 4: Simplify right side
    13,903.92x = 208,155,436.20
  5. Step 5: Solve for x
    x = 208,155,436.20/13,903.92
  6. Step 6: Final answer
    x = 14,970.99

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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.