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Finding the Fourth Proportional to 39,978.63, 60,004.53 and 20,270.79

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Solution

The fourth proportional to 39,978.63, 60,004.53 and 20,270.79 is: 30,424.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,978.63 : 60,004.53 = 20,270.79 : x
  2. Step 2: Convert to fraction form
    39,978.63/60,004.53 = 20,270.79/x
  3. Step 3: Cross multiply
    39,978.63x = 60,004.53 × 20,270.79
  4. Step 4: Simplify right side
    39,978.63x = 1,216,339,226.68
  5. Step 5: Solve for x
    x = 1,216,339,226.68/39,978.63
  6. Step 6: Final answer
    x = 30,424.74

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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.