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Finding the Fourth Proportional to 1,257.28, 1,885.92 and 379.78

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Solution

The fourth proportional to 1,257.28, 1,885.92 and 379.78 is: 569.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.28 : 1,885.92 = 379.78 : x
  2. Step 2: Convert to fraction form
    1,257.28/1,885.92 = 379.78/x
  3. Step 3: Cross multiply
    1,257.28x = 1,885.92 × 379.78
  4. Step 4: Simplify right side
    1,257.28x = 716,234.94
  5. Step 5: Solve for x
    x = 716,234.94/1,257.28
  6. Step 6: Final answer
    x = 569.67

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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.