Home / 13,353.06-18,406.77-9,990.78

Finding the Fourth Proportional to 13,353.06, 18,406.77 and 9,990.78

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Solution

The fourth proportional to 13,353.06, 18,406.77 and 9,990.78 is: 13,771.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,353.06 : 18,406.77 = 9,990.78 : x
  2. Step 2: Convert to fraction form
    13,353.06/18,406.77 = 9,990.78/x
  3. Step 3: Cross multiply
    13,353.06x = 18,406.77 × 9,990.78
  4. Step 4: Simplify right side
    13,353.06x = 183,897,989.58
  5. Step 5: Solve for x
    x = 183,897,989.58/13,353.06
  6. Step 6: Final answer
    x = 13,771.97

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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.