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Finding the Fourth Proportional to 1,270.40, 1,905.88 and 539.60

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Solution

The fourth proportional to 1,270.40, 1,905.88 and 539.60 is: 809.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.40 : 1,905.88 = 539.60 : x
  2. Step 2: Convert to fraction form
    1,270.40/1,905.88 = 539.60/x
  3. Step 3: Cross multiply
    1,270.40x = 1,905.88 × 539.60
  4. Step 4: Simplify right side
    1,270.40x = 1,028,412.85
  5. Step 5: Solve for x
    x = 1,028,412.85/1,270.40
  6. Step 6: Final answer
    x = 809.52

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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.