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Finding the Fourth Proportional to 221,907, 306,231.66 and 121,305.72

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Solution

The fourth proportional to 221,907, 306,231.66 and 121,305.72 is: 167,401.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,907 : 306,231.66 = 121,305.72 : x
  2. Step 2: Convert to fraction form
    221,907/306,231.66 = 121,305.72/x
  3. Step 3: Cross multiply
    221,907x = 306,231.66 × 121,305.72
  4. Step 4: Simplify right side
    221,907x = 37,147,652,003.10
  5. Step 5: Solve for x
    x = 37,147,652,003.10/221,907
  6. Step 6: Final answer
    x = 167,401.89

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1.5x scale

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.