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Finding the Fourth Proportional to 13,039.71, 18,009.57 and 8,783.38

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Solution

The fourth proportional to 13,039.71, 18,009.57 and 8,783.38 is: 12,131.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,039.71 : 18,009.57 = 8,783.38 : x
  2. Step 2: Convert to fraction form
    13,039.71/18,009.57 = 8,783.38/x
  3. Step 3: Cross multiply
    13,039.71x = 18,009.57 × 8,783.38
  4. Step 4: Simplify right side
    13,039.71x = 158,184,896.95
  5. Step 5: Solve for x
    x = 158,184,896.95/13,039.71
  6. Step 6: Final answer
    x = 12,131.01

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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.