Home / 1,286.43-1,929.63-312.53

Finding the Fourth Proportional to 1,286.43, 1,929.63 and 312.53

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Solution

The fourth proportional to 1,286.43, 1,929.63 and 312.53 is: 468.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.43 : 1,929.63 = 312.53 : x
  2. Step 2: Convert to fraction form
    1,286.43/1,929.63 = 312.53/x
  3. Step 3: Cross multiply
    1,286.43x = 1,929.63 × 312.53
  4. Step 4: Simplify right side
    1,286.43x = 603,063.68
  5. Step 5: Solve for x
    x = 603,063.68/1,286.43
  6. Step 6: Final answer
    x = 468.79

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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.