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Finding the Fourth Proportional to 420,350.33, 630,861.74 and 220,788.40

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Solution

The fourth proportional to 420,350.33, 630,861.74 and 220,788.40 is: 331,359.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,350.33 : 630,861.74 = 220,788.40 : x
  2. Step 2: Convert to fraction form
    420,350.33/630,861.74 = 220,788.40/x
  3. Step 3: Cross multiply
    420,350.33x = 630,861.74 × 220,788.40
  4. Step 4: Simplify right side
    420,350.33x = 139,286,954,195.82
  5. Step 5: Solve for x
    x = 139,286,954,195.82/420,350.33
  6. Step 6: Final answer
    x = 331,359.21

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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.