Home / 1,511.28-2,085.30-921.99

Finding the Fourth Proportional to 1,511.28, 2,085.30 and 921.99

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Solution

The fourth proportional to 1,511.28, 2,085.30 and 921.99 is: 1,272.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,511.28 : 2,085.30 = 921.99 : x
  2. Step 2: Convert to fraction form
    1,511.28/2,085.30 = 921.99/x
  3. Step 3: Cross multiply
    1,511.28x = 2,085.30 × 921.99
  4. Step 4: Simplify right side
    1,511.28x = 1,922,625.75
  5. Step 5: Solve for x
    x = 1,922,625.75/1,511.28
  6. Step 6: Final answer
    x = 1,272.18

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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.