Home / 1,511.85-2,085.10-921.97

Finding the Fourth Proportional to 1,511.85, 2,085.10 and 921.97

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Solution

The fourth proportional to 1,511.85, 2,085.10 and 921.97 is: 1,271.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,511.85 : 2,085.10 = 921.97 : x
  2. Step 2: Convert to fraction form
    1,511.85/2,085.10 = 921.97/x
  3. Step 3: Cross multiply
    1,511.85x = 2,085.10 × 921.97
  4. Step 4: Simplify right side
    1,511.85x = 1,922,399.65
  5. Step 5: Solve for x
    x = 1,922,399.65/1,511.85
  6. Step 6: Final answer
    x = 1,271.55

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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.