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Finding the Fourth Proportional to 1,986.96, 2,981.38 and 891.64

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Solution

The fourth proportional to 1,986.96, 2,981.38 and 891.64 is: 1,337.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,986.96 : 2,981.38 = 891.64 : x
  2. Step 2: Convert to fraction form
    1,986.96/2,981.38 = 891.64/x
  3. Step 3: Cross multiply
    1,986.96x = 2,981.38 × 891.64
  4. Step 4: Simplify right side
    1,986.96x = 2,658,317.66
  5. Step 5: Solve for x
    x = 2,658,317.66/1,986.96
  6. Step 6: Final answer
    x = 1,337.88

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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.