Home / 2,135.87-2,945.65-1,389.55

Finding the Fourth Proportional to 2,135.87, 2,945.65 and 1,389.55

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Solution

The fourth proportional to 2,135.87, 2,945.65 and 1,389.55 is: 1,916.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,135.87 : 2,945.65 = 1,389.55 : x
  2. Step 2: Convert to fraction form
    2,135.87/2,945.65 = 1,389.55/x
  3. Step 3: Cross multiply
    2,135.87x = 2,945.65 × 1,389.55
  4. Step 4: Simplify right side
    2,135.87x = 4,093,127.96
  5. Step 5: Solve for x
    x = 4,093,127.96/2,135.87
  6. Step 6: Final answer
    x = 1,916.38

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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.