Home / 3,215.20-4,822.80-1,990.40

Finding the Fourth Proportional to 3,215.20, 4,822.80 and 1,990.40

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Solution

The fourth proportional to 3,215.20, 4,822.80 and 1,990.40 is: 2,985.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,215.20 : 4,822.80 = 1,990.40 : x
  2. Step 2: Convert to fraction form
    3,215.20/4,822.80 = 1,990.40/x
  3. Step 3: Cross multiply
    3,215.20x = 4,822.80 × 1,990.40
  4. Step 4: Simplify right side
    3,215.20x = 9,599,301.12
  5. Step 5: Solve for x
    x = 9,599,301.12/3,215.20
  6. Step 6: Final answer
    x = 2,985.60

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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.