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Finding the Fourth Proportional to 936.33, 1,290.98 and 788.64

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Solution

The fourth proportional to 936.33, 1,290.98 and 788.64 is: 1,087.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.33 : 1,290.98 = 788.64 : x
  2. Step 2: Convert to fraction form
    936.33/1,290.98 = 788.64/x
  3. Step 3: Cross multiply
    936.33x = 1,290.98 × 788.64
  4. Step 4: Simplify right side
    936.33x = 1,018,114.52
  5. Step 5: Solve for x
    x = 1,018,114.52/936.33
  6. Step 6: Final answer
    x = 1,087.35

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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.