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Finding the Fourth Proportional to 545,390.20, 818,571.30 and 320,469.40

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Solution

The fourth proportional to 545,390.20, 818,571.30 and 320,469.40 is: 480,989.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    545,390.20 : 818,571.30 = 320,469.40 : x
  2. Step 2: Convert to fraction form
    545,390.20/818,571.30 = 320,469.40/x
  3. Step 3: Cross multiply
    545,390.20x = 818,571.30 × 320,469.40
  4. Step 4: Simplify right side
    545,390.20x = 262,327,053,368.22
  5. Step 5: Solve for x
    x = 262,327,053,368.22/545,390.20
  6. Step 6: Final answer
    x = 480,989.67

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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.