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Finding the Fourth Proportional to 4,289.78, 6,435.78 and 1,211.78

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Solution

The fourth proportional to 4,289.78, 6,435.78 and 1,211.78 is: 1,817.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,289.78 : 6,435.78 = 1,211.78 : x
  2. Step 2: Convert to fraction form
    4,289.78/6,435.78 = 1,211.78/x
  3. Step 3: Cross multiply
    4,289.78x = 6,435.78 × 1,211.78
  4. Step 4: Simplify right side
    4,289.78x = 7,798,749.49
  5. Step 5: Solve for x
    x = 7,798,749.49/4,289.78
  6. Step 6: Final answer
    x = 1,817.98

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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.