Home / 1,431.06-2,143.86-815.19

Finding the Fourth Proportional to 1,431.06, 2,143.86 and 815.19

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Solution

The fourth proportional to 1,431.06, 2,143.86 and 815.19 is: 1,221.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,431.06 : 2,143.86 = 815.19 : x
  2. Step 2: Convert to fraction form
    1,431.06/2,143.86 = 815.19/x
  3. Step 3: Cross multiply
    1,431.06x = 2,143.86 × 815.19
  4. Step 4: Simplify right side
    1,431.06x = 1,747,653.23
  5. Step 5: Solve for x
    x = 1,747,653.23/1,431.06
  6. Step 6: Final answer
    x = 1,221.23

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.