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Finding the Fourth Proportional to 221,959, 306,303.44 and 121,357

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Solution

The fourth proportional to 221,959, 306,303.44 and 121,357 is: 167,472.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,959 : 306,303.44 = 121,357 : x
  2. Step 2: Convert to fraction form
    221,959/306,303.44 = 121,357/x
  3. Step 3: Cross multiply
    221,959x = 306,303.44 × 121,357
  4. Step 4: Simplify right side
    221,959x = 37,172,066,568.08
  5. Step 5: Solve for x
    x = 37,172,066,568.08/221,959
  6. Step 6: Final answer
    x = 167,472.67

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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.