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Finding the Fourth Proportional to 19,688.50, 27,170.13 and 10,856.50

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Solution

The fourth proportional to 19,688.50, 27,170.13 and 10,856.50 is: 14,981.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,688.50 : 27,170.13 = 10,856.50 : x
  2. Step 2: Convert to fraction form
    19,688.50/27,170.13 = 10,856.50/x
  3. Step 3: Cross multiply
    19,688.50x = 27,170.13 × 10,856.50
  4. Step 4: Simplify right side
    19,688.50x = 294,972,516.35
  5. Step 5: Solve for x
    x = 294,972,516.35/19,688.50
  6. Step 6: Final answer
    x = 14,981.97

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.