Home / 1,911.89-2,638.50-1,125.65

Finding the Fourth Proportional to 1,911.89, 2,638.50 and 1,125.65

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Solution

The fourth proportional to 1,911.89, 2,638.50 and 1,125.65 is: 1,553.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.89 : 2,638.50 = 1,125.65 : x
  2. Step 2: Convert to fraction form
    1,911.89/2,638.50 = 1,125.65/x
  3. Step 3: Cross multiply
    1,911.89x = 2,638.50 × 1,125.65
  4. Step 4: Simplify right side
    1,911.89x = 2,970,027.53
  5. Step 5: Solve for x
    x = 2,970,027.53/1,911.89
  6. Step 6: Final answer
    x = 1,553.45

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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.