Home / 3,111.20-4,666.80-919.95

Finding the Fourth Proportional to 3,111.20, 4,666.80 and 919.95

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Solution

The fourth proportional to 3,111.20, 4,666.80 and 919.95 is: 1,379.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,111.20 : 4,666.80 = 919.95 : x
  2. Step 2: Convert to fraction form
    3,111.20/4,666.80 = 919.95/x
  3. Step 3: Cross multiply
    3,111.20x = 4,666.80 × 919.95
  4. Step 4: Simplify right side
    3,111.20x = 4,293,222.66
  5. Step 5: Solve for x
    x = 4,293,222.66/3,111.20
  6. Step 6: Final answer
    x = 1,379.93

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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.