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Finding the Fourth Proportional to 638,656.85, 958,059.39 and 212,230.73

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Solution

The fourth proportional to 638,656.85, 958,059.39 and 212,230.73 is: 318,370.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,656.85 : 958,059.39 = 212,230.73 : x
  2. Step 2: Convert to fraction form
    638,656.85/958,059.39 = 212,230.73/x
  3. Step 3: Cross multiply
    638,656.85x = 958,059.39 × 212,230.73
  4. Step 4: Simplify right side
    638,656.85x = 203,329,646,914.07
  5. Step 5: Solve for x
    x = 203,329,646,914.07/638,656.85
  6. Step 6: Final answer
    x = 318,370.73

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Double scale
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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.