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Finding the Fourth Proportional to 6,443.80, 9,665.70 and 3,938.20

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Solution

The fourth proportional to 6,443.80, 9,665.70 and 3,938.20 is: 5,907.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,443.80 : 9,665.70 = 3,938.20 : x
  2. Step 2: Convert to fraction form
    6,443.80/9,665.70 = 3,938.20/x
  3. Step 3: Cross multiply
    6,443.80x = 9,665.70 × 3,938.20
  4. Step 4: Simplify right side
    6,443.80x = 38,065,459.74
  5. Step 5: Solve for x
    x = 38,065,459.74/6,443.80
  6. Step 6: Final answer
    x = 5,907.30

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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.