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Finding the Fourth Proportional to 18,978.65, 26,201.47 and 12,613.87

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Solution

The fourth proportional to 18,978.65, 26,201.47 and 12,613.87 is: 17,414.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.65 : 26,201.47 = 12,613.87 : x
  2. Step 2: Convert to fraction form
    18,978.65/26,201.47 = 12,613.87/x
  3. Step 3: Cross multiply
    18,978.65x = 26,201.47 × 12,613.87
  4. Step 4: Simplify right side
    18,978.65x = 330,501,873.32
  5. Step 5: Solve for x
    x = 330,501,873.32/18,978.65
  6. Step 6: Final answer
    x = 17,414.41

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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.