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Finding the Fourth Proportional to 121,203.10, 181,912.65 and 71,220.70

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Solution

The fourth proportional to 121,203.10, 181,912.65 and 71,220.70 is: 106,894.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,203.10 : 181,912.65 = 71,220.70 : x
  2. Step 2: Convert to fraction form
    121,203.10/181,912.65 = 71,220.70/x
  3. Step 3: Cross multiply
    121,203.10x = 181,912.65 × 71,220.70
  4. Step 4: Simplify right side
    121,203.10x = 12,955,946,271.86
  5. Step 5: Solve for x
    x = 12,955,946,271.86/121,203.10
  6. Step 6: Final answer
    x = 106,894.51

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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.