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Finding the Fourth Proportional to 1,405.28, 1,939.17 and 775.83

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Solution

The fourth proportional to 1,405.28, 1,939.17 and 775.83 is: 1,070.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.28 : 1,939.17 = 775.83 : x
  2. Step 2: Convert to fraction form
    1,405.28/1,939.17 = 775.83/x
  3. Step 3: Cross multiply
    1,405.28x = 1,939.17 × 775.83
  4. Step 4: Simplify right side
    1,405.28x = 1,504,466.26
  5. Step 5: Solve for x
    x = 1,504,466.26/1,405.28
  6. Step 6: Final answer
    x = 1,070.58

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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.