Home / 2,175.80-3,001.86-1,390.30

Finding the Fourth Proportional to 2,175.80, 3,001.86 and 1,390.30

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Solution

The fourth proportional to 2,175.80, 3,001.86 and 1,390.30 is: 1,918.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,175.80 : 3,001.86 = 1,390.30 : x
  2. Step 2: Convert to fraction form
    2,175.80/3,001.86 = 1,390.30/x
  3. Step 3: Cross multiply
    2,175.80x = 3,001.86 × 1,390.30
  4. Step 4: Simplify right side
    2,175.80x = 4,173,485.96
  5. Step 5: Solve for x
    x = 4,173,485.96/2,175.80
  6. Step 6: Final answer
    x = 1,918.14

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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.