Home / 1,286.33-1,929.50-312.43

Finding the Fourth Proportional to 1,286.33, 1,929.50 and 312.43

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Solution

The fourth proportional to 1,286.33, 1,929.50 and 312.43 is: 468.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.33 : 1,929.50 = 312.43 : x
  2. Step 2: Convert to fraction form
    1,286.33/1,929.50 = 312.43/x
  3. Step 3: Cross multiply
    1,286.33x = 1,929.50 × 312.43
  4. Step 4: Simplify right side
    1,286.33x = 602,827.30
  5. Step 5: Solve for x
    x = 602,827.30/1,286.33
  6. Step 6: Final answer
    x = 468.64

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Double scale
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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.