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Finding the Fourth Proportional to 420,443.81, 630,766.19 and 136,134.67

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Solution

The fourth proportional to 420,443.81, 630,766.19 and 136,134.67 is: 204,234.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,443.81 : 630,766.19 = 136,134.67 : x
  2. Step 2: Convert to fraction form
    420,443.81/630,766.19 = 136,134.67/x
  3. Step 3: Cross multiply
    420,443.81x = 630,766.19 × 136,134.67
  4. Step 4: Simplify right side
    420,443.81x = 85,869,144,865.22
  5. Step 5: Solve for x
    x = 85,869,144,865.22/420,443.81
  6. Step 6: Final answer
    x = 204,234.53

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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.