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Finding the Fourth Proportional to 221,678.51, 305,916.21 and 121,076.51

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Solution

The fourth proportional to 221,678.51, 305,916.21 and 121,076.51 is: 167,085.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,678.51 : 305,916.21 = 121,076.51 : x
  2. Step 2: Convert to fraction form
    221,678.51/305,916.21 = 121,076.51/x
  3. Step 3: Cross multiply
    221,678.51x = 305,916.21 × 121,076.51
  4. Step 4: Simplify right side
    221,678.51x = 37,039,265,529.65
  5. Step 5: Solve for x
    x = 37,039,265,529.65/221,678.51
  6. Step 6: Final answer
    x = 167,085.51

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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.