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Finding the Fourth Proportional to 290,809.64, 401,286.70 and 161,727.20

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Solution

The fourth proportional to 290,809.64, 401,286.70 and 161,727.20 is: 223,166.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    290,809.64 : 401,286.70 = 161,727.20 : x
  2. Step 2: Convert to fraction form
    290,809.64/401,286.70 = 161,727.20/x
  3. Step 3: Cross multiply
    290,809.64x = 401,286.70 × 161,727.20
  4. Step 4: Simplify right side
    290,809.64x = 64,898,974,388.24
  5. Step 5: Solve for x
    x = 64,898,974,388.24/290,809.64
  6. Step 6: Final answer
    x = 223,166.52

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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.