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Finding the Fourth Proportional to 21,903.40, 32,863.20 and 8,765.20

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Solution

The fourth proportional to 21,903.40, 32,863.20 and 8,765.20 is: 13,151.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,903.40 : 32,863.20 = 8,765.20 : x
  2. Step 2: Convert to fraction form
    21,903.40/32,863.20 = 8,765.20/x
  3. Step 3: Cross multiply
    21,903.40x = 32,863.20 × 8,765.20
  4. Step 4: Simplify right side
    21,903.40x = 288,052,520.64
  5. Step 5: Solve for x
    x = 288,052,520.64/21,903.40
  6. Step 6: Final answer
    x = 13,151.04

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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.