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Finding the Fourth Proportional to 1,215.40, 1,822.98 and 393.44

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Solution

The fourth proportional to 1,215.40, 1,822.98 and 393.44 is: 590.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,215.40 : 1,822.98 = 393.44 : x
  2. Step 2: Convert to fraction form
    1,215.40/1,822.98 = 393.44/x
  3. Step 3: Cross multiply
    1,215.40x = 1,822.98 × 393.44
  4. Step 4: Simplify right side
    1,215.40x = 717,233.25
  5. Step 5: Solve for x
    x = 717,233.25/1,215.40
  6. Step 6: Final answer
    x = 590.12

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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.