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Finding the Fourth Proportional to 18,128.70, 27,178.65 and 9,920.70

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Solution

The fourth proportional to 18,128.70, 27,178.65 and 9,920.70 is: 14,873.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,128.70 : 27,178.65 = 9,920.70 : x
  2. Step 2: Convert to fraction form
    18,128.70/27,178.65 = 9,920.70/x
  3. Step 3: Cross multiply
    18,128.70x = 27,178.65 × 9,920.70
  4. Step 4: Simplify right side
    18,128.70x = 269,631,233.06
  5. Step 5: Solve for x
    x = 269,631,233.06/18,128.70
  6. Step 6: Final answer
    x = 14,873.17

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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.