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Finding the Fourth Proportional to 305,698.32, 421,816.68 and 171,536.40

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Solution

The fourth proportional to 305,698.32, 421,816.68 and 171,536.40 is: 236,693.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,698.32 : 421,816.68 = 171,536.40 : x
  2. Step 2: Convert to fraction form
    305,698.32/421,816.68 = 171,536.40/x
  3. Step 3: Cross multiply
    305,698.32x = 421,816.68 × 171,536.40
  4. Step 4: Simplify right side
    305,698.32x = 72,356,914,747.15
  5. Step 5: Solve for x
    x = 72,356,914,747.15/305,698.32
  6. Step 6: Final answer
    x = 236,693.86

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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.