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Finding the Fourth Proportional to 2,655.70, 3,984.56 and 990.86

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Solution

The fourth proportional to 2,655.70, 3,984.56 and 990.86 is: 1,486.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,655.70 : 3,984.56 = 990.86 : x
  2. Step 2: Convert to fraction form
    2,655.70/3,984.56 = 990.86/x
  3. Step 3: Cross multiply
    2,655.70x = 3,984.56 × 990.86
  4. Step 4: Simplify right side
    2,655.70x = 3,948,141.12
  5. Step 5: Solve for x
    x = 3,948,141.12/2,655.70
  6. Step 6: Final answer
    x = 1,486.67

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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.