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Finding the Fourth Proportional to 1,405.25, 1,939.20 and 775.77

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Solution

The fourth proportional to 1,405.25, 1,939.20 and 775.77 is: 1,070.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.25 : 1,939.20 = 775.77 : x
  2. Step 2: Convert to fraction form
    1,405.25/1,939.20 = 775.77/x
  3. Step 3: Cross multiply
    1,405.25x = 1,939.20 × 775.77
  4. Step 4: Simplify right side
    1,405.25x = 1,504,363.00
  5. Step 5: Solve for x
    x = 1,504,363.00/1,405.25
  6. Step 6: Final answer
    x = 1,070.53

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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.