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Finding the Fourth Proportional to 15,873.70, 21,900.06 and 9,161.03

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Solution

The fourth proportional to 15,873.70, 21,900.06 and 9,161.03 is: 12,638.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,873.70 : 21,900.06 = 9,161.03 : x
  2. Step 2: Convert to fraction form
    15,873.70/21,900.06 = 9,161.03/x
  3. Step 3: Cross multiply
    15,873.70x = 21,900.06 × 9,161.03
  4. Step 4: Simplify right side
    15,873.70x = 200,627,106.66
  5. Step 5: Solve for x
    x = 200,627,106.66/15,873.70
  6. Step 6: Final answer
    x = 12,638.96

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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.