Home / 1,921.35-2,647.56-1,423.20

Finding the Fourth Proportional to 1,921.35, 2,647.56 and 1,423.20

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Solution

The fourth proportional to 1,921.35, 2,647.56 and 1,423.20 is: 1,961.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.35 : 2,647.56 = 1,423.20 : x
  2. Step 2: Convert to fraction form
    1,921.35/2,647.56 = 1,423.20/x
  3. Step 3: Cross multiply
    1,921.35x = 2,647.56 × 1,423.20
  4. Step 4: Simplify right side
    1,921.35x = 3,768,007.39
  5. Step 5: Solve for x
    x = 3,768,007.39/1,921.35
  6. Step 6: Final answer
    x = 1,961.12

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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.