Home / 2,985.62-4,120.80-2,279.30

Finding the Fourth Proportional to 2,985.62, 4,120.80 and 2,279.30

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Solution

The fourth proportional to 2,985.62, 4,120.80 and 2,279.30 is: 3,145.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,985.62 : 4,120.80 = 2,279.30 : x
  2. Step 2: Convert to fraction form
    2,985.62/4,120.80 = 2,279.30/x
  3. Step 3: Cross multiply
    2,985.62x = 4,120.80 × 2,279.30
  4. Step 4: Simplify right side
    2,985.62x = 9,392,539.44
  5. Step 5: Solve for x
    x = 9,392,539.44/2,985.62
  6. Step 6: Final answer
    x = 3,145.93

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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.