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Finding the Fourth Proportional to 1,200.40, 1,808.20 and 1,127.52

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Solution

The fourth proportional to 1,200.40, 1,808.20 and 1,127.52 is: 1,698.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200.40 : 1,808.20 = 1,127.52 : x
  2. Step 2: Convert to fraction form
    1,200.40/1,808.20 = 1,127.52/x
  3. Step 3: Cross multiply
    1,200.40x = 1,808.20 × 1,127.52
  4. Step 4: Simplify right side
    1,200.40x = 2,038,781.66
  5. Step 5: Solve for x
    x = 2,038,781.66/1,200.40
  6. Step 6: Final answer
    x = 1,698.42

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.