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Finding the Fourth Proportional to 305,811.68, 422,017.20 and 171,674.72

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Solution

The fourth proportional to 305,811.68, 422,017.20 and 171,674.72 is: 236,909.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    305,811.68 : 422,017.20 = 171,674.72 : x
  2. Step 2: Convert to fraction form
    305,811.68/422,017.20 = 171,674.72/x
  3. Step 3: Cross multiply
    305,811.68x = 422,017.20 × 171,674.72
  4. Step 4: Simplify right side
    305,811.68x = 72,449,684,645.18
  5. Step 5: Solve for x
    x = 72,449,684,645.18/305,811.68
  6. Step 6: Final answer
    x = 236,909.48

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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.