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Finding the Fourth Proportional to 1,405, 1,939.70 and 908.36

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Solution

The fourth proportional to 1,405, 1,939.70 and 908.36 is: 1,254.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405 : 1,939.70 = 908.36 : x
  2. Step 2: Convert to fraction form
    1,405/1,939.70 = 908.36/x
  3. Step 3: Cross multiply
    1,405x = 1,939.70 × 908.36
  4. Step 4: Simplify right side
    1,405x = 1,761,945.89
  5. Step 5: Solve for x
    x = 1,761,945.89/1,405
  6. Step 6: Final answer
    x = 1,254.05

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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.