Home / 1,811.49-2,501.90-1,221

Finding the Fourth Proportional to 1,811.49, 2,501.90 and 1,221

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Solution

The fourth proportional to 1,811.49, 2,501.90 and 1,221 is: 1,686.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,811.49 : 2,501.90 = 1,221 : x
  2. Step 2: Convert to fraction form
    1,811.49/2,501.90 = 1,221/x
  3. Step 3: Cross multiply
    1,811.49x = 2,501.90 × 1,221
  4. Step 4: Simplify right side
    1,811.49x = 3,054,813.80
  5. Step 5: Solve for x
    x = 3,054,813.80/1,811.49
  6. Step 6: Final answer
    x = 1,686.35

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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.