Home / 1,270.32-1,905.70-539.90

Finding the Fourth Proportional to 1,270.32, 1,905.70 and 539.90

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Solution

The fourth proportional to 1,270.32, 1,905.70 and 539.90 is: 809.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.32 : 1,905.70 = 539.90 : x
  2. Step 2: Convert to fraction form
    1,270.32/1,905.70 = 539.90/x
  3. Step 3: Cross multiply
    1,270.32x = 1,905.70 × 539.90
  4. Step 4: Simplify right side
    1,270.32x = 1,028,887.43
  5. Step 5: Solve for x
    x = 1,028,887.43/1,270.32
  6. Step 6: Final answer
    x = 809.94

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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.