Home / 1,215.78-1,823.28-393.90

Finding the Fourth Proportional to 1,215.78, 1,823.28 and 393.90

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Solution

The fourth proportional to 1,215.78, 1,823.28 and 393.90 is: 590.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.78 : 1,823.28 = 393.90 : x
  2. Step 2: Convert to fraction form
    1,215.78/1,823.28 = 393.90/x
  3. Step 3: Cross multiply
    1,215.78x = 1,823.28 × 393.90
  4. Step 4: Simplify right side
    1,215.78x = 718,180.88
  5. Step 5: Solve for x
    x = 718,180.88/1,215.78
  6. Step 6: Final answer
    x = 590.72

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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.