Home / 1,911.86-2,638.40-1,072.61

Finding the Fourth Proportional to 1,911.86, 2,638.40 and 1,072.61

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Solution

The fourth proportional to 1,911.86, 2,638.40 and 1,072.61 is: 1,480.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.86 : 2,638.40 = 1,072.61 : x
  2. Step 2: Convert to fraction form
    1,911.86/2,638.40 = 1,072.61/x
  3. Step 3: Cross multiply
    1,911.86x = 2,638.40 × 1,072.61
  4. Step 4: Simplify right side
    1,911.86x = 2,829,955.67
  5. Step 5: Solve for x
    x = 2,829,955.67/1,911.86
  6. Step 6: Final answer
    x = 1,480.21

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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.