Home / 1,318.32-1,974.60-768.78

Finding the Fourth Proportional to 1,318.32, 1,974.60 and 768.78

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Solution

The fourth proportional to 1,318.32, 1,974.60 and 768.78 is: 1,151.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318.32 : 1,974.60 = 768.78 : x
  2. Step 2: Convert to fraction form
    1,318.32/1,974.60 = 768.78/x
  3. Step 3: Cross multiply
    1,318.32x = 1,974.60 × 768.78
  4. Step 4: Simplify right side
    1,318.32x = 1,518,032.99
  5. Step 5: Solve for x
    x = 1,518,032.99/1,318.32
  6. Step 6: Final answer
    x = 1,151.49

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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.