Home / 1,286.24-1,929.35-312.32

Finding the Fourth Proportional to 1,286.24, 1,929.35 and 312.32

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Solution

The fourth proportional to 1,286.24, 1,929.35 and 312.32 is: 468.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,286.24 : 1,929.35 = 312.32 : x
  2. Step 2: Convert to fraction form
    1,286.24/1,929.35 = 312.32/x
  3. Step 3: Cross multiply
    1,286.24x = 1,929.35 × 312.32
  4. Step 4: Simplify right side
    1,286.24x = 602,580.20
  5. Step 5: Solve for x
    x = 602,580.20/1,286.24
  6. Step 6: Final answer
    x = 468.48

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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.