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Finding the Fourth Proportional to 12,289, 18,405.80 and 8,607.66

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Solution

The fourth proportional to 12,289, 18,405.80 and 8,607.66 is: 12,892.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,289 : 18,405.80 = 8,607.66 : x
  2. Step 2: Convert to fraction form
    12,289/18,405.80 = 8,607.66/x
  3. Step 3: Cross multiply
    12,289x = 18,405.80 × 8,607.66
  4. Step 4: Simplify right side
    12,289x = 158,430,868.43
  5. Step 5: Solve for x
    x = 158,430,868.43/12,289
  6. Step 6: Final answer
    x = 12,892.09

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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.