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Finding the Fourth Proportional to 455,435.20, 683,152.80 and 218,720.80

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Solution

The fourth proportional to 455,435.20, 683,152.80 and 218,720.80 is: 328,081.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,435.20 : 683,152.80 = 218,720.80 : x
  2. Step 2: Convert to fraction form
    455,435.20/683,152.80 = 218,720.80/x
  3. Step 3: Cross multiply
    455,435.20x = 683,152.80 × 218,720.80
  4. Step 4: Simplify right side
    455,435.20x = 149,419,726,938.24
  5. Step 5: Solve for x
    x = 149,419,726,938.24/455,435.20
  6. Step 6: Final answer
    x = 328,081.20

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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.