Home / 2,211.95-3,312.46-1,387.78

Finding the Fourth Proportional to 2,211.95, 3,312.46 and 1,387.78

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Solution

The fourth proportional to 2,211.95, 3,312.46 and 1,387.78 is: 2,078.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,211.95 : 3,312.46 = 1,387.78 : x
  2. Step 2: Convert to fraction form
    2,211.95/3,312.46 = 1,387.78/x
  3. Step 3: Cross multiply
    2,211.95x = 3,312.46 × 1,387.78
  4. Step 4: Simplify right side
    2,211.95x = 4,596,965.74
  5. Step 5: Solve for x
    x = 4,596,965.74/2,211.95
  6. Step 6: Final answer
    x = 2,078.24

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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.