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Finding the Fourth Proportional to 107,819.20, 161,728.80 and 66,289.60

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Solution

The fourth proportional to 107,819.20, 161,728.80 and 66,289.60 is: 99,434.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    107,819.20 : 161,728.80 = 66,289.60 : x
  2. Step 2: Convert to fraction form
    107,819.20/161,728.80 = 66,289.60/x
  3. Step 3: Cross multiply
    107,819.20x = 161,728.80 × 66,289.60
  4. Step 4: Simplify right side
    107,819.20x = 10,720,937,460.48
  5. Step 5: Solve for x
    x = 10,720,937,460.48/107,819.20
  6. Step 6: Final answer
    x = 99,434.40

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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.