Home / 3,916.90-5,405.20-2,148.45

Finding the Fourth Proportional to 3,916.90, 5,405.20 and 2,148.45

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Solution

The fourth proportional to 3,916.90, 5,405.20 and 2,148.45 is: 2,964.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,916.90 : 5,405.20 = 2,148.45 : x
  2. Step 2: Convert to fraction form
    3,916.90/5,405.20 = 2,148.45/x
  3. Step 3: Cross multiply
    3,916.90x = 5,405.20 × 2,148.45
  4. Step 4: Simplify right side
    3,916.90x = 11,612,801.94
  5. Step 5: Solve for x
    x = 11,612,801.94/3,916.90
  6. Step 6: Final answer
    x = 2,964.79

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.