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Finding the Fourth Proportional to 72,470.20, 108,705.30 and 19,879.60

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Solution

The fourth proportional to 72,470.20, 108,705.30 and 19,879.60 is: 29,819.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,470.20 : 108,705.30 = 19,879.60 : x
  2. Step 2: Convert to fraction form
    72,470.20/108,705.30 = 19,879.60/x
  3. Step 3: Cross multiply
    72,470.20x = 108,705.30 × 19,879.60
  4. Step 4: Simplify right side
    72,470.20x = 2,161,017,881.88
  5. Step 5: Solve for x
    x = 2,161,017,881.88/72,470.20
  6. Step 6: Final answer
    x = 29,819.40

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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.