Home / 1,985.45-2,739.37-1,188.45

Finding the Fourth Proportional to 1,985.45, 2,739.37 and 1,188.45

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Solution

The fourth proportional to 1,985.45, 2,739.37 and 1,188.45 is: 1,639.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985.45 : 2,739.37 = 1,188.45 : x
  2. Step 2: Convert to fraction form
    1,985.45/2,739.37 = 1,188.45/x
  3. Step 3: Cross multiply
    1,985.45x = 2,739.37 × 1,188.45
  4. Step 4: Simplify right side
    1,985.45x = 3,255,604.28
  5. Step 5: Solve for x
    x = 3,255,604.28/1,985.45
  6. Step 6: Final answer
    x = 1,639.73

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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.