Home / 1,511.39-2,085.68-839.19

Finding the Fourth Proportional to 1,511.39, 2,085.68 and 839.19

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Solution

The fourth proportional to 1,511.39, 2,085.68 and 839.19 is: 1,158.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,511.39 : 2,085.68 = 839.19 : x
  2. Step 2: Convert to fraction form
    1,511.39/2,085.68 = 839.19/x
  3. Step 3: Cross multiply
    1,511.39x = 2,085.68 × 839.19
  4. Step 4: Simplify right side
    1,511.39x = 1,750,279.84
  5. Step 5: Solve for x
    x = 1,750,279.84/1,511.39
  6. Step 6: Final answer
    x = 1,158.06

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Double scale
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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.