Home / 2,816.30-3,889.74-2,151.68

Finding the Fourth Proportional to 2,816.30, 3,889.74 and 2,151.68

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Solution

The fourth proportional to 2,816.30, 3,889.74 and 2,151.68 is: 2,971.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,816.30 : 3,889.74 = 2,151.68 : x
  2. Step 2: Convert to fraction form
    2,816.30/3,889.74 = 2,151.68/x
  3. Step 3: Cross multiply
    2,816.30x = 3,889.74 × 2,151.68
  4. Step 4: Simplify right side
    2,816.30x = 8,369,475.76
  5. Step 5: Solve for x
    x = 8,369,475.76/2,816.30
  6. Step 6: Final answer
    x = 2,971.80

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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.