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Finding the Fourth Proportional to 305,387.56, 421,434.93 and 171,251.56

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Solution

The fourth proportional to 305,387.56, 421,434.93 and 171,251.56 is: 236,327.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,387.56 : 421,434.93 = 171,251.56 : x
  2. Step 2: Convert to fraction form
    305,387.56/421,434.93 = 171,251.56/x
  3. Step 3: Cross multiply
    305,387.56x = 421,434.93 × 171,251.56
  4. Step 4: Simplify right side
    305,387.56x = 72,171,389,200.99
  5. Step 5: Solve for x
    x = 72,171,389,200.99/305,387.56
  6. Step 6: Final answer
    x = 236,327.21

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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.