Home / 2,115.19-3,170.35-1,421.02

Finding the Fourth Proportional to 2,115.19, 3,170.35 and 1,421.02

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Solution

The fourth proportional to 2,115.19, 3,170.35 and 1,421.02 is: 2,129.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.19 : 3,170.35 = 1,421.02 : x
  2. Step 2: Convert to fraction form
    2,115.19/3,170.35 = 1,421.02/x
  3. Step 3: Cross multiply
    2,115.19x = 3,170.35 × 1,421.02
  4. Step 4: Simplify right side
    2,115.19x = 4,505,130.76
  5. Step 5: Solve for x
    x = 4,505,130.76/2,115.19
  6. Step 6: Final answer
    x = 2,129.89

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.