Home / 1,286.19-1,929.27-312.29

Finding the Fourth Proportional to 1,286.19, 1,929.27 and 312.29

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Solution

The fourth proportional to 1,286.19, 1,929.27 and 312.29 is: 468.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.19 : 1,929.27 = 312.29 : x
  2. Step 2: Convert to fraction form
    1,286.19/1,929.27 = 312.29/x
  3. Step 3: Cross multiply
    1,286.19x = 1,929.27 × 312.29
  4. Step 4: Simplify right side
    1,286.19x = 602,501.34
  5. Step 5: Solve for x
    x = 602,501.34/1,286.19
  6. Step 6: Final answer
    x = 468.44

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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.