Home / 13,887.90-20,817.27-9,990.18

Finding the Fourth Proportional to 13,887.90, 20,817.27 and 9,990.18

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Solution

The fourth proportional to 13,887.90, 20,817.27 and 9,990.18 is: 14,974.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,887.90 : 20,817.27 = 9,990.18 : x
  2. Step 2: Convert to fraction form
    13,887.90/20,817.27 = 9,990.18/x
  3. Step 3: Cross multiply
    13,887.90x = 20,817.27 × 9,990.18
  4. Step 4: Simplify right side
    13,887.90x = 207,968,274.41
  5. Step 5: Solve for x
    x = 207,968,274.41/13,887.90
  6. Step 6: Final answer
    x = 14,974.78

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1.5x scale

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.