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Finding the Fourth Proportional to 15,016.81, 20,721.50 and 8,300.74

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Solution

The fourth proportional to 15,016.81, 20,721.50 and 8,300.74 is: 11,454.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,016.81 : 20,721.50 = 8,300.74 : x
  2. Step 2: Convert to fraction form
    15,016.81/20,721.50 = 8,300.74/x
  3. Step 3: Cross multiply
    15,016.81x = 20,721.50 × 8,300.74
  4. Step 4: Simplify right side
    15,016.81x = 172,003,721.73
  5. Step 5: Solve for x
    x = 172,003,721.73/15,016.81
  6. Step 6: Final answer
    x = 11,454.08

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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.