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Finding the Fourth Proportional to 936, 1,297.20 and 921.60

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Solution

The fourth proportional to 936, 1,297.20 and 921.60 is: 1,277.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    936 : 1,297.20 = 921.60 : x
  2. Step 2: Convert to fraction form
    936/1,297.20 = 921.60/x
  3. Step 3: Cross multiply
    936x = 1,297.20 × 921.60
  4. Step 4: Simplify right side
    936x = 1,195,499.52
  5. Step 5: Solve for x
    x = 1,195,499.52/936
  6. Step 6: Final answer
    x = 1,277.24

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.