Home / 2,120.02-3,179.20-638.79

Finding the Fourth Proportional to 2,120.02, 3,179.20 and 638.79

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Solution

The fourth proportional to 2,120.02, 3,179.20 and 638.79 is: 957.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.02 : 3,179.20 = 638.79 : x
  2. Step 2: Convert to fraction form
    2,120.02/3,179.20 = 638.79/x
  3. Step 3: Cross multiply
    2,120.02x = 3,179.20 × 638.79
  4. Step 4: Simplify right side
    2,120.02x = 2,030,828.85
  5. Step 5: Solve for x
    x = 2,030,828.85/2,120.02
  6. Step 6: Final answer
    x = 957.93

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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.