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Finding the Fourth Proportional to 121,203.10, 181,804.65 and 79,212.70

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Solution

The fourth proportional to 121,203.10, 181,804.65 and 79,212.70 is: 118,819.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,203.10 : 181,804.65 = 79,212.70 : x
  2. Step 2: Convert to fraction form
    121,203.10/181,804.65 = 79,212.70/x
  3. Step 3: Cross multiply
    121,203.10x = 181,804.65 × 79,212.70
  4. Step 4: Simplify right side
    121,203.10x = 14,401,237,199.06
  5. Step 5: Solve for x
    x = 14,401,237,199.06/121,203.10
  6. Step 6: Final answer
    x = 118,819.05

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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.