Home / 1,911.14-2,638.75-1,320.65

Finding the Fourth Proportional to 1,911.14, 2,638.75 and 1,320.65

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Solution

The fourth proportional to 1,911.14, 2,638.75 and 1,320.65 is: 1,823.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,911.14 : 2,638.75 = 1,320.65 : x
  2. Step 2: Convert to fraction form
    1,911.14/2,638.75 = 1,320.65/x
  3. Step 3: Cross multiply
    1,911.14x = 2,638.75 × 1,320.65
  4. Step 4: Simplify right side
    1,911.14x = 3,484,858.58
  5. Step 5: Solve for x
    x = 3,484,858.58/1,911.14
  6. Step 6: Final answer
    x = 1,823.44

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1.5x scale

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.