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Finding the Fourth Proportional to 40,287.92, 60,431.82 and 13,992.89

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Solution

The fourth proportional to 40,287.92, 60,431.82 and 13,992.89 is: 20,989.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    40,287.92 : 60,431.82 = 13,992.89 : x
  2. Step 2: Convert to fraction form
    40,287.92/60,431.82 = 13,992.89/x
  3. Step 3: Cross multiply
    40,287.92x = 60,431.82 × 13,992.89
  4. Step 4: Simplify right side
    40,287.92x = 845,615,507.60
  5. Step 5: Solve for x
    x = 845,615,507.60/40,287.92
  6. Step 6: Final answer
    x = 20,989.31

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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.