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Finding the Fourth Proportional to 1,208.80, 1,809.60 and 1,137.60

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Solution

The fourth proportional to 1,208.80, 1,809.60 and 1,137.60 is: 1,703.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,208.80 : 1,809.60 = 1,137.60 : x
  2. Step 2: Convert to fraction form
    1,208.80/1,809.60 = 1,137.60/x
  3. Step 3: Cross multiply
    1,208.80x = 1,809.60 × 1,137.60
  4. Step 4: Simplify right side
    1,208.80x = 2,058,600.96
  5. Step 5: Solve for x
    x = 2,058,600.96/1,208.80
  6. Step 6: Final answer
    x = 1,703.01

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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.