Home / 1,986.89-2,980.29-1,170.35

Finding the Fourth Proportional to 1,986.89, 2,980.29 and 1,170.35

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Solution

The fourth proportional to 1,986.89, 2,980.29 and 1,170.35 is: 1,755.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.89 : 2,980.29 = 1,170.35 : x
  2. Step 2: Convert to fraction form
    1,986.89/2,980.29 = 1,170.35/x
  3. Step 3: Cross multiply
    1,986.89x = 2,980.29 × 1,170.35
  4. Step 4: Simplify right side
    1,986.89x = 3,487,967.50
  5. Step 5: Solve for x
    x = 3,487,967.50/1,986.89
  6. Step 6: Final answer
    x = 1,755.49

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1.5x scale

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.