Home / 6,890.90-10,305.20-5,309.42

Finding the Fourth Proportional to 6,890.90, 10,305.20 and 5,309.42

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Solution

The fourth proportional to 6,890.90, 10,305.20 and 5,309.42 is: 7,940.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,890.90 : 10,305.20 = 5,309.42 : x
  2. Step 2: Convert to fraction form
    6,890.90/10,305.20 = 5,309.42/x
  3. Step 3: Cross multiply
    6,890.90x = 10,305.20 × 5,309.42
  4. Step 4: Simplify right side
    6,890.90x = 54,714,668.75
  5. Step 5: Solve for x
    x = 54,714,668.75/6,890.90
  6. Step 6: Final answer
    x = 7,940.14

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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.