Home / 6,420.39-9,623.90-3,128.96

Finding the Fourth Proportional to 6,420.39, 9,623.90 and 3,128.96

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Solution

The fourth proportional to 6,420.39, 9,623.90 and 3,128.96 is: 4,690.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,420.39 : 9,623.90 = 3,128.96 : x
  2. Step 2: Convert to fraction form
    6,420.39/9,623.90 = 3,128.96/x
  3. Step 3: Cross multiply
    6,420.39x = 9,623.90 × 3,128.96
  4. Step 4: Simplify right side
    6,420.39x = 30,112,734.38
  5. Step 5: Solve for x
    x = 30,112,734.38/6,420.39
  6. Step 6: Final answer
    x = 4,690.17

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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.