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Finding the Fourth Proportional to 1,638.55, 2,457.69 and 664.93

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Solution

The fourth proportional to 1,638.55, 2,457.69 and 664.93 is: 997.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.55 : 2,457.69 = 664.93 : x
  2. Step 2: Convert to fraction form
    1,638.55/2,457.69 = 664.93/x
  3. Step 3: Cross multiply
    1,638.55x = 2,457.69 × 664.93
  4. Step 4: Simplify right side
    1,638.55x = 1,634,191.81
  5. Step 5: Solve for x
    x = 1,634,191.81/1,638.55
  6. Step 6: Final answer
    x = 997.34

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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.