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Finding the Fourth Proportional to 940.36, 1,403.45 and 858.12

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Solution

The fourth proportional to 940.36, 1,403.45 and 858.12 is: 1,280.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.36 : 1,403.45 = 858.12 : x
  2. Step 2: Convert to fraction form
    940.36/1,403.45 = 858.12/x
  3. Step 3: Cross multiply
    940.36x = 1,403.45 × 858.12
  4. Step 4: Simplify right side
    940.36x = 1,204,328.51
  5. Step 5: Solve for x
    x = 1,204,328.51/940.36
  6. Step 6: Final answer
    x = 1,280.71

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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.