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Finding the Fourth Proportional to 15,009.87, 20,712.20 and 8,721.03

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Solution

The fourth proportional to 15,009.87, 20,712.20 and 8,721.03 is: 12,034.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,009.87 : 20,712.20 = 8,721.03 : x
  2. Step 2: Convert to fraction form
    15,009.87/20,712.20 = 8,721.03/x
  3. Step 3: Cross multiply
    15,009.87x = 20,712.20 × 8,721.03
  4. Step 4: Simplify right side
    15,009.87x = 180,631,673.96
  5. Step 5: Solve for x
    x = 180,631,673.96/15,009.87
  6. Step 6: Final answer
    x = 12,034.19

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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.