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Finding the Fourth Proportional to 163,811.20, 245,724.90 and 85,079.20

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Solution

The fourth proportional to 163,811.20, 245,724.90 and 85,079.20 is: 127,623.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    163,811.20 : 245,724.90 = 85,079.20 : x
  2. Step 2: Convert to fraction form
    163,811.20/245,724.90 = 85,079.20/x
  3. Step 3: Cross multiply
    163,811.20x = 245,724.90 × 85,079.20
  4. Step 4: Simplify right side
    163,811.20x = 20,906,077,912.08
  5. Step 5: Solve for x
    x = 20,906,077,912.08/163,811.20
  6. Step 6: Final answer
    x = 127,623.01

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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.