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Finding the Fourth Proportional to 318,203.96, 439,216.34 and 209,392.20

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Solution

The fourth proportional to 318,203.96, 439,216.34 and 209,392.20 is: 289,023.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,203.96 : 439,216.34 = 209,392.20 : x
  2. Step 2: Convert to fraction form
    318,203.96/439,216.34 = 209,392.20/x
  3. Step 3: Cross multiply
    318,203.96x = 439,216.34 × 209,392.20
  4. Step 4: Simplify right side
    318,203.96x = 91,968,474,661.59
  5. Step 5: Solve for x
    x = 91,968,474,661.59/318,203.96
  6. Step 6: Final answer
    x = 289,023.67

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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.