Home / 6,420.36-9,631.62-3,131.40

Finding the Fourth Proportional to 6,420.36, 9,631.62 and 3,131.40

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Solution

The fourth proportional to 6,420.36, 9,631.62 and 3,131.40 is: 4,697.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,420.36 : 9,631.62 = 3,131.40 : x
  2. Step 2: Convert to fraction form
    6,420.36/9,631.62 = 3,131.40/x
  3. Step 3: Cross multiply
    6,420.36x = 9,631.62 × 3,131.40
  4. Step 4: Simplify right side
    6,420.36x = 30,160,454.87
  5. Step 5: Solve for x
    x = 30,160,454.87/6,420.36
  6. Step 6: Final answer
    x = 4,697.63

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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.