Home / 1,290.84-1,780.68-936.36

Finding the Fourth Proportional to 1,290.84, 1,780.68 and 936.36

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Solution

The fourth proportional to 1,290.84, 1,780.68 and 936.36 is: 1,291.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290.84 : 1,780.68 = 936.36 : x
  2. Step 2: Convert to fraction form
    1,290.84/1,780.68 = 936.36/x
  3. Step 3: Cross multiply
    1,290.84x = 1,780.68 × 936.36
  4. Step 4: Simplify right side
    1,290.84x = 1,667,357.52
  5. Step 5: Solve for x
    x = 1,667,357.52/1,290.84
  6. Step 6: Final answer
    x = 1,291.68

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Half scale
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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.