Home / 1,288.05-1,927.29-768.34

Finding the Fourth Proportional to 1,288.05, 1,927.29 and 768.34

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Solution

The fourth proportional to 1,288.05, 1,927.29 and 768.34 is: 1,149.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,288.05 : 1,927.29 = 768.34 : x
  2. Step 2: Convert to fraction form
    1,288.05/1,927.29 = 768.34/x
  3. Step 3: Cross multiply
    1,288.05x = 1,927.29 × 768.34
  4. Step 4: Simplify right side
    1,288.05x = 1,480,814.00
  5. Step 5: Solve for x
    x = 1,480,814.00/1,288.05
  6. Step 6: Final answer
    x = 1,149.66

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.