Home / 2,115.61-3,171.69-1,420.16

Finding the Fourth Proportional to 2,115.61, 3,171.69 and 1,420.16

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Solution

The fourth proportional to 2,115.61, 3,171.69 and 1,420.16 is: 2,129.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,115.61 : 3,171.69 = 1,420.16 : x
  2. Step 2: Convert to fraction form
    2,115.61/3,171.69 = 1,420.16/x
  3. Step 3: Cross multiply
    2,115.61x = 3,171.69 × 1,420.16
  4. Step 4: Simplify right side
    2,115.61x = 4,504,291.41
  5. Step 5: Solve for x
    x = 4,504,291.41/2,115.61
  6. Step 6: Final answer
    x = 2,129.08

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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.