Home / 2,165.16-2,987.85-1,221

Finding the Fourth Proportional to 2,165.16, 2,987.85 and 1,221

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Solution

The fourth proportional to 2,165.16, 2,987.85 and 1,221 is: 1,684.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,165.16 : 2,987.85 = 1,221 : x
  2. Step 2: Convert to fraction form
    2,165.16/2,987.85 = 1,221/x
  3. Step 3: Cross multiply
    2,165.16x = 2,987.85 × 1,221
  4. Step 4: Simplify right side
    2,165.16x = 3,648,164.85
  5. Step 5: Solve for x
    x = 3,648,164.85/2,165.16
  6. Step 6: Final answer
    x = 1,684.94

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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.