Home / 1,281.16-1,921.41-356.80

Finding the Fourth Proportional to 1,281.16, 1,921.41 and 356.80

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Solution

The fourth proportional to 1,281.16, 1,921.41 and 356.80 is: 535.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.16 : 1,921.41 = 356.80 : x
  2. Step 2: Convert to fraction form
    1,281.16/1,921.41 = 356.80/x
  3. Step 3: Cross multiply
    1,281.16x = 1,921.41 × 356.80
  4. Step 4: Simplify right side
    1,281.16x = 685,559.09
  5. Step 5: Solve for x
    x = 685,559.09/1,281.16
  6. Step 6: Final answer
    x = 535.11

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.