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Finding the Fourth Proportional to 222,090, 306,489.12 and 121,488

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Solution

The fourth proportional to 222,090, 306,489.12 and 121,488 is: 167,656.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    222,090 : 306,489.12 = 121,488 : x
  2. Step 2: Convert to fraction form
    222,090/306,489.12 = 121,488/x
  3. Step 3: Cross multiply
    222,090x = 306,489.12 × 121,488
  4. Step 4: Simplify right side
    222,090x = 37,234,750,210.56
  5. Step 5: Solve for x
    x = 37,234,750,210.56/222,090
  6. Step 6: Final answer
    x = 167,656.13

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.