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Finding the Fourth Proportional to 2,655.12, 3,982.76 and 989.68

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Solution

The fourth proportional to 2,655.12, 3,982.76 and 989.68 is: 1,484.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,655.12 : 3,982.76 = 989.68 : x
  2. Step 2: Convert to fraction form
    2,655.12/3,982.76 = 989.68/x
  3. Step 3: Cross multiply
    2,655.12x = 3,982.76 × 989.68
  4. Step 4: Simplify right side
    2,655.12x = 3,941,657.92
  5. Step 5: Solve for x
    x = 3,941,657.92/2,655.12
  6. Step 6: Final answer
    x = 1,484.55

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Similar ratio
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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.