Home / 1,511.12-2,085.42-921.56

Finding the Fourth Proportional to 1,511.12, 2,085.42 and 921.56

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Solution

The fourth proportional to 1,511.12, 2,085.42 and 921.56 is: 1,271.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,511.12 : 2,085.42 = 921.56 : x
  2. Step 2: Convert to fraction form
    1,511.12/2,085.42 = 921.56/x
  3. Step 3: Cross multiply
    1,511.12x = 2,085.42 × 921.56
  4. Step 4: Simplify right side
    1,511.12x = 1,921,839.66
  5. Step 5: Solve for x
    x = 1,921,839.66/1,511.12
  6. Step 6: Final answer
    x = 1,271.80

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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.