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Finding the Fourth Proportional to 4,260, 6,390 and 1,338.39

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Solution

The fourth proportional to 4,260, 6,390 and 1,338.39 is: 2,007.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,260 : 6,390 = 1,338.39 : x
  2. Step 2: Convert to fraction form
    4,260/6,390 = 1,338.39/x
  3. Step 3: Cross multiply
    4,260x = 6,390 × 1,338.39
  4. Step 4: Simplify right side
    4,260x = 8,552,312.10
  5. Step 5: Solve for x
    x = 8,552,312.10/4,260
  6. Step 6: Final answer
    x = 2,007.59

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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.