Home / 2,890.30-3,989.75-1,948.78

Finding the Fourth Proportional to 2,890.30, 3,989.75 and 1,948.78

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Solution

The fourth proportional to 2,890.30, 3,989.75 and 1,948.78 is: 2,690.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,890.30 : 3,989.75 = 1,948.78 : x
  2. Step 2: Convert to fraction form
    2,890.30/3,989.75 = 1,948.78/x
  3. Step 3: Cross multiply
    2,890.30x = 3,989.75 × 1,948.78
  4. Step 4: Simplify right side
    2,890.30x = 7,775,145.01
  5. Step 5: Solve for x
    x = 7,775,145.01/2,890.30
  6. Step 6: Final answer
    x = 2,690.08

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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.