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Finding the Fourth Proportional to 18,004.71, 27,007.20 and 17,978.79

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Solution

The fourth proportional to 18,004.71, 27,007.20 and 17,978.79 is: 26,968.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,004.71 : 27,007.20 = 17,978.79 : x
  2. Step 2: Convert to fraction form
    18,004.71/27,007.20 = 17,978.79/x
  3. Step 3: Cross multiply
    18,004.71x = 27,007.20 × 17,978.79
  4. Step 4: Simplify right side
    18,004.71x = 485,556,777.29
  5. Step 5: Solve for x
    x = 485,556,777.29/18,004.71
  6. Step 6: Final answer
    x = 26,968.32

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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.