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Finding the Fourth Proportional to 15,009.74, 20,715.06 and 8,636.61

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Solution

The fourth proportional to 15,009.74, 20,715.06 and 8,636.61 is: 11,919.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,009.74 : 20,715.06 = 8,636.61 : x
  2. Step 2: Convert to fraction form
    15,009.74/20,715.06 = 8,636.61/x
  3. Step 3: Cross multiply
    15,009.74x = 20,715.06 × 8,636.61
  4. Step 4: Simplify right side
    15,009.74x = 178,907,894.35
  5. Step 5: Solve for x
    x = 178,907,894.35/15,009.74
  6. Step 6: Final answer
    x = 11,919.46

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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.