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Finding the Fourth Proportional to 2,187.51, 3,001.78 and 1,989.51

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Solution

The fourth proportional to 2,187.51, 3,001.78 and 1,989.51 is: 2,730.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187.51 : 3,001.78 = 1,989.51 : x
  2. Step 2: Convert to fraction form
    2,187.51/3,001.78 = 1,989.51/x
  3. Step 3: Cross multiply
    2,187.51x = 3,001.78 × 1,989.51
  4. Step 4: Simplify right side
    2,187.51x = 5,972,071.33
  5. Step 5: Solve for x
    x = 5,972,071.33/2,187.51
  6. Step 6: Final answer
    x = 2,730.08

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.