Home / 1,921.50-2,651.70-1,223.82

Finding the Fourth Proportional to 1,921.50, 2,651.70 and 1,223.82

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Solution

The fourth proportional to 1,921.50, 2,651.70 and 1,223.82 is: 1,688.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,921.50 : 2,651.70 = 1,223.82 : x
  2. Step 2: Convert to fraction form
    1,921.50/2,651.70 = 1,223.82/x
  3. Step 3: Cross multiply
    1,921.50x = 2,651.70 × 1,223.82
  4. Step 4: Simplify right side
    1,921.50x = 3,245,203.49
  5. Step 5: Solve for x
    x = 3,245,203.49/1,921.50
  6. Step 6: Final answer
    x = 1,688.89

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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.