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Finding the Fourth Proportional to 2,157.57, 3,234.18 and 840.50

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Solution

The fourth proportional to 2,157.57, 3,234.18 and 840.50 is: 1,259.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,157.57 : 3,234.18 = 840.50 : x
  2. Step 2: Convert to fraction form
    2,157.57/3,234.18 = 840.50/x
  3. Step 3: Cross multiply
    2,157.57x = 3,234.18 × 840.50
  4. Step 4: Simplify right side
    2,157.57x = 2,718,322.67
  5. Step 5: Solve for x
    x = 2,718,322.67/2,157.57
  6. Step 6: Final answer
    x = 1,259.90

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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.