Home / 3,405.72-4,699.89-1,990.38

Finding the Fourth Proportional to 3,405.72, 4,699.89 and 1,990.38

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Solution

The fourth proportional to 3,405.72, 4,699.89 and 1,990.38 is: 2,746.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,405.72 : 4,699.89 = 1,990.38 : x
  2. Step 2: Convert to fraction form
    3,405.72/4,699.89 = 1,990.38/x
  3. Step 3: Cross multiply
    3,405.72x = 4,699.89 × 1,990.38
  4. Step 4: Simplify right side
    3,405.72x = 9,354,567.06
  5. Step 5: Solve for x
    x = 9,354,567.06/3,405.72
  6. Step 6: Final answer
    x = 2,746.72

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.