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Finding the Fourth Proportional to 258,856.62, 388,378.38 and 90,401.76

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Solution

The fourth proportional to 258,856.62, 388,378.38 and 90,401.76 is: 135,635.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    258,856.62 : 388,378.38 = 90,401.76 : x
  2. Step 2: Convert to fraction form
    258,856.62/388,378.38 = 90,401.76/x
  3. Step 3: Cross multiply
    258,856.62x = 388,378.38 × 90,401.76
  4. Step 4: Simplify right side
    258,856.62x = 35,110,089,097.95
  5. Step 5: Solve for x
    x = 35,110,089,097.95/258,856.62
  6. Step 6: Final answer
    x = 135,635.28

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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.