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Finding the Fourth Proportional to 18,802.32, 28,201.86 and 7,115.64

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Solution

The fourth proportional to 18,802.32, 28,201.86 and 7,115.64 is: 10,672.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,802.32 : 28,201.86 = 7,115.64 : x
  2. Step 2: Convert to fraction form
    18,802.32/28,201.86 = 7,115.64/x
  3. Step 3: Cross multiply
    18,802.32x = 28,201.86 × 7,115.64
  4. Step 4: Simplify right side
    18,802.32x = 200,674,283.09
  5. Step 5: Solve for x
    x = 200,674,283.09/18,802.32
  6. Step 6: Final answer
    x = 10,672.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.