Home / 1,281.32-1,921.88-356.79

Finding the Fourth Proportional to 1,281.32, 1,921.88 and 356.79

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Solution

The fourth proportional to 1,281.32, 1,921.88 and 356.79 is: 535.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.32 : 1,921.88 = 356.79 : x
  2. Step 2: Convert to fraction form
    1,281.32/1,921.88 = 356.79/x
  3. Step 3: Cross multiply
    1,281.32x = 1,921.88 × 356.79
  4. Step 4: Simplify right side
    1,281.32x = 685,705.78
  5. Step 5: Solve for x
    x = 685,705.78/1,281.32
  6. Step 6: Final answer
    x = 535.16

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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.