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Finding the Fourth Proportional to 1,640.43, 2,457.99 and 817.86

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Solution

The fourth proportional to 1,640.43, 2,457.99 and 817.86 is: 1,225.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,640.43 : 2,457.99 = 817.86 : x
  2. Step 2: Convert to fraction form
    1,640.43/2,457.99 = 817.86/x
  3. Step 3: Cross multiply
    1,640.43x = 2,457.99 × 817.86
  4. Step 4: Simplify right side
    1,640.43x = 2,010,291.70
  5. Step 5: Solve for x
    x = 2,010,291.70/1,640.43
  6. Step 6: Final answer
    x = 1,225.47

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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.