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Finding the Fourth Proportional to 305,361.70, 421,398.65 and 169,416.36

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Solution

The fourth proportional to 305,361.70, 421,398.65 and 169,416.36 is: 233,794.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,361.70 : 421,398.65 = 169,416.36 : x
  2. Step 2: Convert to fraction form
    305,361.70/421,398.65 = 169,416.36/x
  3. Step 3: Cross multiply
    305,361.70x = 421,398.65 × 169,416.36
  4. Step 4: Simplify right side
    305,361.70x = 71,391,825,815.45
  5. Step 5: Solve for x
    x = 71,391,825,815.45/305,361.70
  6. Step 6: Final answer
    x = 233,794.30

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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.