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Finding the Fourth Proportional to 1,403.02, 1,935.78 and 905.48

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Solution

The fourth proportional to 1,403.02, 1,935.78 and 905.48 is: 1,249.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,403.02 : 1,935.78 = 905.48 : x
  2. Step 2: Convert to fraction form
    1,403.02/1,935.78 = 905.48/x
  3. Step 3: Cross multiply
    1,403.02x = 1,935.78 × 905.48
  4. Step 4: Simplify right side
    1,403.02x = 1,752,810.07
  5. Step 5: Solve for x
    x = 1,752,810.07/1,403.02
  6. Step 6: Final answer
    x = 1,249.31

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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.