Home / 1,109.20-1,664.18-415.95

Finding the Fourth Proportional to 1,109.20, 1,664.18 and 415.95

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Solution

The fourth proportional to 1,109.20, 1,664.18 and 415.95 is: 624.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.20 : 1,664.18 = 415.95 : x
  2. Step 2: Convert to fraction form
    1,109.20/1,664.18 = 415.95/x
  3. Step 3: Cross multiply
    1,109.20x = 1,664.18 × 415.95
  4. Step 4: Simplify right side
    1,109.20x = 692,205.27
  5. Step 5: Solve for x
    x = 692,205.27/1,109.20
  6. Step 6: Final answer
    x = 624.06

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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.