Home / 1,220.19-1,830.35-398.58

Finding the Fourth Proportional to 1,220.19, 1,830.35 and 398.58

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Solution

The fourth proportional to 1,220.19, 1,830.35 and 398.58 is: 597.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,220.19 : 1,830.35 = 398.58 : x
  2. Step 2: Convert to fraction form
    1,220.19/1,830.35 = 398.58/x
  3. Step 3: Cross multiply
    1,220.19x = 1,830.35 × 398.58
  4. Step 4: Simplify right side
    1,220.19x = 729,540.90
  5. Step 5: Solve for x
    x = 729,540.90/1,220.19
  6. Step 6: Final answer
    x = 597.89

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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.