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Finding the Fourth Proportional to 247,309.28, 370,991.12 and 78,790.40

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Solution

The fourth proportional to 247,309.28, 370,991.12 and 78,790.40 is: 118,194.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    247,309.28 : 370,991.12 = 78,790.40 : x
  2. Step 2: Convert to fraction form
    247,309.28/370,991.12 = 78,790.40/x
  3. Step 3: Cross multiply
    247,309.28x = 370,991.12 × 78,790.40
  4. Step 4: Simplify right side
    247,309.28x = 29,230,538,741.25
  5. Step 5: Solve for x
    x = 29,230,538,741.25/247,309.28
  6. Step 6: Final answer
    x = 118,194.27

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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.