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Finding the Fourth Proportional to 1,215.12, 1,822.22 and 393.17

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Solution

The fourth proportional to 1,215.12, 1,822.22 and 393.17 is: 589.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.12 : 1,822.22 = 393.17 : x
  2. Step 2: Convert to fraction form
    1,215.12/1,822.22 = 393.17/x
  3. Step 3: Cross multiply
    1,215.12x = 1,822.22 × 393.17
  4. Step 4: Simplify right side
    1,215.12x = 716,442.88
  5. Step 5: Solve for x
    x = 716,442.88/1,215.12
  6. Step 6: Final answer
    x = 589.61

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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.