Home / 1,911.98-2,638.40-1,125.88

Finding the Fourth Proportional to 1,911.98, 2,638.40 and 1,125.88

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Solution

The fourth proportional to 1,911.98, 2,638.40 and 1,125.88 is: 1,553.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.98 : 2,638.40 = 1,125.88 : x
  2. Step 2: Convert to fraction form
    1,911.98/2,638.40 = 1,125.88/x
  3. Step 3: Cross multiply
    1,911.98x = 2,638.40 × 1,125.88
  4. Step 4: Simplify right side
    1,911.98x = 2,970,521.79
  5. Step 5: Solve for x
    x = 2,970,521.79/1,911.98
  6. Step 6: Final answer
    x = 1,553.64

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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.