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Finding the Fourth Proportional to 18,971.75, 28,441.55 and 7,871.51

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Solution

The fourth proportional to 18,971.75, 28,441.55 and 7,871.51 is: 11,800.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,971.75 : 28,441.55 = 7,871.51 : x
  2. Step 2: Convert to fraction form
    18,971.75/28,441.55 = 7,871.51/x
  3. Step 3: Cross multiply
    18,971.75x = 28,441.55 × 7,871.51
  4. Step 4: Simplify right side
    18,971.75x = 223,877,763.68
  5. Step 5: Solve for x
    x = 223,877,763.68/18,971.75
  6. Step 6: Final answer
    x = 11,800.59

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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.