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Finding the Fourth Proportional to 2,156.50, 3,234.78 and 617.50

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Solution

The fourth proportional to 2,156.50, 3,234.78 and 617.50 is: 926.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,156.50 : 3,234.78 = 617.50 : x
  2. Step 2: Convert to fraction form
    2,156.50/3,234.78 = 617.50/x
  3. Step 3: Cross multiply
    2,156.50x = 3,234.78 × 617.50
  4. Step 4: Simplify right side
    2,156.50x = 1,997,476.65
  5. Step 5: Solve for x
    x = 1,997,476.65/2,156.50
  6. Step 6: Final answer
    x = 926.26

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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.