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Finding the Fourth Proportional to 15,120.92, 20,870.70 and 10,086.68

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Solution

The fourth proportional to 15,120.92, 20,870.70 and 10,086.68 is: 13,922.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,120.92 : 20,870.70 = 10,086.68 : x
  2. Step 2: Convert to fraction form
    15,120.92/20,870.70 = 10,086.68/x
  3. Step 3: Cross multiply
    15,120.92x = 20,870.70 × 10,086.68
  4. Step 4: Simplify right side
    15,120.92x = 210,516,072.28
  5. Step 5: Solve for x
    x = 210,516,072.28/15,120.92
  6. Step 6: Final answer
    x = 13,922.17

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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.