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Finding the Fourth Proportional to 455,423.70, 683,135.55 and 218,709.30

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Solution

The fourth proportional to 455,423.70, 683,135.55 and 218,709.30 is: 328,063.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,423.70 : 683,135.55 = 218,709.30 : x
  2. Step 2: Convert to fraction form
    455,423.70/683,135.55 = 218,709.30/x
  3. Step 3: Cross multiply
    455,423.70x = 683,135.55 × 218,709.30
  4. Step 4: Simplify right side
    455,423.70x = 149,408,097,945.62
  5. Step 5: Solve for x
    x = 149,408,097,945.62/455,423.70
  6. Step 6: Final answer
    x = 328,063.95

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Similar ratio
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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.