Home / 1,987.51-2,742.88-1,148.37

Finding the Fourth Proportional to 1,987.51, 2,742.88 and 1,148.37

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Solution

The fourth proportional to 1,987.51, 2,742.88 and 1,148.37 is: 1,584.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,987.51 : 2,742.88 = 1,148.37 : x
  2. Step 2: Convert to fraction form
    1,987.51/2,742.88 = 1,148.37/x
  3. Step 3: Cross multiply
    1,987.51x = 2,742.88 × 1,148.37
  4. Step 4: Simplify right side
    1,987.51x = 3,149,827.39
  5. Step 5: Solve for x
    x = 3,149,827.39/1,987.51
  6. Step 6: Final answer
    x = 1,584.81

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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.