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Finding the Fourth Proportional to 70,485.20, 105,540.74 and 55,134.79

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Solution

The fourth proportional to 70,485.20, 105,540.74 and 55,134.79 is: 82,555.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,485.20 : 105,540.74 = 55,134.79 : x
  2. Step 2: Convert to fraction form
    70,485.20/105,540.74 = 55,134.79/x
  3. Step 3: Cross multiply
    70,485.20x = 105,540.74 × 55,134.79
  4. Step 4: Simplify right side
    70,485.20x = 5,818,966,203.57
  5. Step 5: Solve for x
    x = 5,818,966,203.57/70,485.20
  6. Step 6: Final answer
    x = 82,555.86

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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.