Home / 1,916.20-2,643.49-1,207.55

Finding the Fourth Proportional to 1,916.20, 2,643.49 and 1,207.55

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Solution

The fourth proportional to 1,916.20, 2,643.49 and 1,207.55 is: 1,665.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,916.20 : 2,643.49 = 1,207.55 : x
  2. Step 2: Convert to fraction form
    1,916.20/2,643.49 = 1,207.55/x
  3. Step 3: Cross multiply
    1,916.20x = 2,643.49 × 1,207.55
  4. Step 4: Simplify right side
    1,916.20x = 3,192,146.35
  5. Step 5: Solve for x
    x = 3,192,146.35/1,916.20
  6. Step 6: Final answer
    x = 1,665.87

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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.