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Finding the Fourth Proportional to 1,168.40, 1,611.20 and 1,003.20

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Solution

The fourth proportional to 1,168.40, 1,611.20 and 1,003.20 is: 1,383.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,168.40 : 1,611.20 = 1,003.20 : x
  2. Step 2: Convert to fraction form
    1,168.40/1,611.20 = 1,003.20/x
  3. Step 3: Cross multiply
    1,168.40x = 1,611.20 × 1,003.20
  4. Step 4: Simplify right side
    1,168.40x = 1,616,355.84
  5. Step 5: Solve for x
    x = 1,616,355.84/1,168.40
  6. Step 6: Final answer
    x = 1,383.39

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.