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Finding the Fourth Proportional to 1,986.88, 2,980.26 and 670.72

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Solution

The fourth proportional to 1,986.88, 2,980.26 and 670.72 is: 1,006.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.88 : 2,980.26 = 670.72 : x
  2. Step 2: Convert to fraction form
    1,986.88/2,980.26 = 670.72/x
  3. Step 3: Cross multiply
    1,986.88x = 2,980.26 × 670.72
  4. Step 4: Simplify right side
    1,986.88x = 1,998,919.99
  5. Step 5: Solve for x
    x = 1,998,919.99/1,986.88
  6. Step 6: Final answer
    x = 1,006.06

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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.