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Finding the Fourth Proportional to 13,628.86, 18,803.59 and 7,959.51

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Solution

The fourth proportional to 13,628.86, 18,803.59 and 7,959.51 is: 10,981.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,628.86 : 18,803.59 = 7,959.51 : x
  2. Step 2: Convert to fraction form
    13,628.86/18,803.59 = 7,959.51/x
  3. Step 3: Cross multiply
    13,628.86x = 18,803.59 × 7,959.51
  4. Step 4: Simplify right side
    13,628.86x = 149,667,362.64
  5. Step 5: Solve for x
    x = 149,667,362.64/13,628.86
  6. Step 6: Final answer
    x = 10,981.65

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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.