Home / 1,511.46-2,085.21-921.78

Finding the Fourth Proportional to 1,511.46, 2,085.21 and 921.78

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Solution

The fourth proportional to 1,511.46, 2,085.21 and 921.78 is: 1,271.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,511.46 : 2,085.21 = 921.78 : x
  2. Step 2: Convert to fraction form
    1,511.46/2,085.21 = 921.78/x
  3. Step 3: Cross multiply
    1,511.46x = 2,085.21 × 921.78
  4. Step 4: Simplify right side
    1,511.46x = 1,922,104.87
  5. Step 5: Solve for x
    x = 1,922,104.87/1,511.46
  6. Step 6: Final answer
    x = 1,271.69

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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.