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Finding the Fourth Proportional to 18,978.69, 26,192.07 and 13,965.93

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Solution

The fourth proportional to 18,978.69, 26,192.07 and 13,965.93 is: 19,274.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.69 : 26,192.07 = 13,965.93 : x
  2. Step 2: Convert to fraction form
    18,978.69/26,192.07 = 13,965.93/x
  3. Step 3: Cross multiply
    18,978.69x = 26,192.07 × 13,965.93
  4. Step 4: Simplify right side
    18,978.69x = 365,796,616.18
  5. Step 5: Solve for x
    x = 365,796,616.18/18,978.69
  6. Step 6: Final answer
    x = 19,274.07

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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.