Home / 1,283.20-1,762.40-1,187.20

Finding the Fourth Proportional to 1,283.20, 1,762.40 and 1,187.20

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Solution

The fourth proportional to 1,283.20, 1,762.40 and 1,187.20 is: 1,630.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,283.20 : 1,762.40 = 1,187.20 : x
  2. Step 2: Convert to fraction form
    1,283.20/1,762.40 = 1,187.20/x
  3. Step 3: Cross multiply
    1,283.20x = 1,762.40 × 1,187.20
  4. Step 4: Simplify right side
    1,283.20x = 2,092,321.28
  5. Step 5: Solve for x
    x = 2,092,321.28/1,283.20
  6. Step 6: Final answer
    x = 1,630.55

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.