Home / 1,286.55-1,929.82-312.66

Finding the Fourth Proportional to 1,286.55, 1,929.82 and 312.66

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Solution

The fourth proportional to 1,286.55, 1,929.82 and 312.66 is: 468.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.55 : 1,929.82 = 312.66 : x
  2. Step 2: Convert to fraction form
    1,286.55/1,929.82 = 312.66/x
  3. Step 3: Cross multiply
    1,286.55x = 1,929.82 × 312.66
  4. Step 4: Simplify right side
    1,286.55x = 603,366.31
  5. Step 5: Solve for x
    x = 603,366.31/1,286.55
  6. Step 6: Final answer
    x = 468.98

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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.