Home / 2,117.28-2,921.88-1,185.78

Finding the Fourth Proportional to 2,117.28, 2,921.88 and 1,185.78

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Solution

The fourth proportional to 2,117.28, 2,921.88 and 1,185.78 is: 1,636.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,117.28 : 2,921.88 = 1,185.78 : x
  2. Step 2: Convert to fraction form
    2,117.28/2,921.88 = 1,185.78/x
  3. Step 3: Cross multiply
    2,117.28x = 2,921.88 × 1,185.78
  4. Step 4: Simplify right side
    2,117.28x = 3,464,706.87
  5. Step 5: Solve for x
    x = 3,464,706.87/2,117.28
  6. Step 6: Final answer
    x = 1,636.40

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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.