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Finding the Fourth Proportional to 18,659.89, 27,981.68 and 9,892.81

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Solution

The fourth proportional to 18,659.89, 27,981.68 and 9,892.81 is: 14,834.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,659.89 : 27,981.68 = 9,892.81 : x
  2. Step 2: Convert to fraction form
    18,659.89/27,981.68 = 9,892.81/x
  3. Step 3: Cross multiply
    18,659.89x = 27,981.68 × 9,892.81
  4. Step 4: Simplify right side
    18,659.89x = 276,817,394.26
  5. Step 5: Solve for x
    x = 276,817,394.26/18,659.89
  6. Step 6: Final answer
    x = 14,834.89

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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.