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Finding the Fourth Proportional to 939.36, 1,400.78 and 872.48

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Solution

The fourth proportional to 939.36, 1,400.78 and 872.48 is: 1,301.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.36 : 1,400.78 = 872.48 : x
  2. Step 2: Convert to fraction form
    939.36/1,400.78 = 872.48/x
  3. Step 3: Cross multiply
    939.36x = 1,400.78 × 872.48
  4. Step 4: Simplify right side
    939.36x = 1,222,152.53
  5. Step 5: Solve for x
    x = 1,222,152.53/939.36
  6. Step 6: Final answer
    x = 1,301.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.