Home / 2,187.21-3,016.05-1,440.21

Finding the Fourth Proportional to 2,187.21, 3,016.05 and 1,440.21

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Solution

The fourth proportional to 2,187.21, 3,016.05 and 1,440.21 is: 1,985.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,187.21 : 3,016.05 = 1,440.21 : x
  2. Step 2: Convert to fraction form
    2,187.21/3,016.05 = 1,440.21/x
  3. Step 3: Cross multiply
    2,187.21x = 3,016.05 × 1,440.21
  4. Step 4: Simplify right side
    2,187.21x = 4,343,741.43
  5. Step 5: Solve for x
    x = 4,343,741.43/2,187.21
  6. Step 6: Final answer
    x = 1,985.98

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Double scale
Find fourth proportional to 2,188.21, 3,017.43 and 1,441.21
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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.