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Finding the Fourth Proportional to 447,760.40, 671,640.60 and 389,440.40

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Solution

The fourth proportional to 447,760.40, 671,640.60 and 389,440.40 is: 584,160.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    447,760.40 : 671,640.60 = 389,440.40 : x
  2. Step 2: Convert to fraction form
    447,760.40/671,640.60 = 389,440.40/x
  3. Step 3: Cross multiply
    447,760.40x = 671,640.60 × 389,440.40
  4. Step 4: Simplify right side
    447,760.40x = 261,563,983,920.24
  5. Step 5: Solve for x
    x = 261,563,983,920.24/447,760.40
  6. Step 6: Final answer
    x = 584,160.60

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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.