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Finding the Fourth Proportional to 2,157.30, 3,234.30 and 986.49

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Solution

The fourth proportional to 2,157.30, 3,234.30 and 986.49 is: 1,478.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,157.30 : 3,234.30 = 986.49 : x
  2. Step 2: Convert to fraction form
    2,157.30/3,234.30 = 986.49/x
  3. Step 3: Cross multiply
    2,157.30x = 3,234.30 × 986.49
  4. Step 4: Simplify right side
    2,157.30x = 3,190,604.61
  5. Step 5: Solve for x
    x = 3,190,604.61/2,157.30
  6. Step 6: Final answer
    x = 1,478.98

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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.