Home / 3,210.20-4,815.30-1,985.40

Finding the Fourth Proportional to 3,210.20, 4,815.30 and 1,985.40

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Solution

The fourth proportional to 3,210.20, 4,815.30 and 1,985.40 is: 2,978.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,210.20 : 4,815.30 = 1,985.40 : x
  2. Step 2: Convert to fraction form
    3,210.20/4,815.30 = 1,985.40/x
  3. Step 3: Cross multiply
    3,210.20x = 4,815.30 × 1,985.40
  4. Step 4: Simplify right side
    3,210.20x = 9,560,296.62
  5. Step 5: Solve for x
    x = 9,560,296.62/3,210.20
  6. Step 6: Final answer
    x = 2,978.10

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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.