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Finding the Fourth Proportional to 1,638.18, 2,457.71 and 663.75

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Solution

The fourth proportional to 1,638.18, 2,457.71 and 663.75 is: 995.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.18 : 2,457.71 = 663.75 : x
  2. Step 2: Convert to fraction form
    1,638.18/2,457.71 = 663.75/x
  3. Step 3: Cross multiply
    1,638.18x = 2,457.71 × 663.75
  4. Step 4: Simplify right side
    1,638.18x = 1,631,301.69
  5. Step 5: Solve for x
    x = 1,631,301.69/1,638.18
  6. Step 6: Final answer
    x = 995.80

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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.