Home / 1,511.31-2,085.75-922.20

Finding the Fourth Proportional to 1,511.31, 2,085.75 and 922.20

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Solution

The fourth proportional to 1,511.31, 2,085.75 and 922.20 is: 1,272.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,511.31 : 2,085.75 = 922.20 : x
  2. Step 2: Convert to fraction form
    1,511.31/2,085.75 = 922.20/x
  3. Step 3: Cross multiply
    1,511.31x = 2,085.75 × 922.20
  4. Step 4: Simplify right side
    1,511.31x = 1,923,478.65
  5. Step 5: Solve for x
    x = 1,923,478.65/1,511.31
  6. Step 6: Final answer
    x = 1,272.72

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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.