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Finding the Fourth Proportional to 18,669, 28,003.48 and 12,807.84

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Solution

The fourth proportional to 18,669, 28,003.48 and 12,807.84 is: 19,211.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,669 : 28,003.48 = 12,807.84 : x
  2. Step 2: Convert to fraction form
    18,669/28,003.48 = 12,807.84/x
  3. Step 3: Cross multiply
    18,669x = 28,003.48 × 12,807.84
  4. Step 4: Simplify right side
    18,669x = 358,664,091.28
  5. Step 5: Solve for x
    x = 358,664,091.28/18,669
  6. Step 6: Final answer
    x = 19,211.75

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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.