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Finding the Fourth Proportional to 19,989.28, 29,990.88 and 8,903.84

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Solution

The fourth proportional to 19,989.28, 29,990.88 and 8,903.84 is: 13,358.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,989.28 : 29,990.88 = 8,903.84 : x
  2. Step 2: Convert to fraction form
    19,989.28/29,990.88 = 8,903.84/x
  3. Step 3: Cross multiply
    19,989.28x = 29,990.88 × 8,903.84
  4. Step 4: Simplify right side
    19,989.28x = 267,033,996.98
  5. Step 5: Solve for x
    x = 267,033,996.98/19,989.28
  6. Step 6: Final answer
    x = 13,358.86

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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.