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Finding the Fourth Proportional to 258,856.62, 388,378.35 and 90,401.73

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Solution

The fourth proportional to 258,856.62, 388,378.35 and 90,401.73 is: 135,635.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,856.62 : 388,378.35 = 90,401.73 : x
  2. Step 2: Convert to fraction form
    258,856.62/388,378.35 = 90,401.73/x
  3. Step 3: Cross multiply
    258,856.62x = 388,378.35 × 90,401.73
  4. Step 4: Simplify right side
    258,856.62x = 35,110,074,734.55
  5. Step 5: Solve for x
    x = 35,110,074,734.55/258,856.62
  6. Step 6: Final answer
    x = 135,635.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.