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Finding the Fourth Proportional to 936.36, 1,290.96 and 805.08

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Solution

The fourth proportional to 936.36, 1,290.96 and 805.08 is: 1,109.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.36 : 1,290.96 = 805.08 : x
  2. Step 2: Convert to fraction form
    936.36/1,290.96 = 805.08/x
  3. Step 3: Cross multiply
    936.36x = 1,290.96 × 805.08
  4. Step 4: Simplify right side
    936.36x = 1,039,326.08
  5. Step 5: Solve for x
    x = 1,039,326.08/936.36
  6. Step 6: Final answer
    x = 1,109.96

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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.