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Finding the Fourth Proportional to 15,015.75, 20,719.94 and 8,300.47

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Solution

The fourth proportional to 15,015.75, 20,719.94 and 8,300.47 is: 11,453.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,015.75 : 20,719.94 = 8,300.47 : x
  2. Step 2: Convert to fraction form
    15,015.75/20,719.94 = 8,300.47/x
  3. Step 3: Cross multiply
    15,015.75x = 20,719.94 × 8,300.47
  4. Step 4: Simplify right side
    15,015.75x = 171,985,240.37
  5. Step 5: Solve for x
    x = 171,985,240.37/15,015.75
  6. Step 6: Final answer
    x = 11,453.66

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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.