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Finding the Fourth Proportional to 14,110.60, 21,165.90 and 8,939.40

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Solution

The fourth proportional to 14,110.60, 21,165.90 and 8,939.40 is: 13,409.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    14,110.60 : 21,165.90 = 8,939.40 : x
  2. Step 2: Convert to fraction form
    14,110.60/21,165.90 = 8,939.40/x
  3. Step 3: Cross multiply
    14,110.60x = 21,165.90 × 8,939.40
  4. Step 4: Simplify right side
    14,110.60x = 189,210,446.46
  5. Step 5: Solve for x
    x = 189,210,446.46/14,110.60
  6. Step 6: Final answer
    x = 13,409.10

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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.