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Finding the Fourth Proportional to 2,638.50, 3,957.75 and 690.66

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Solution

The fourth proportional to 2,638.50, 3,957.75 and 690.66 is: 1,035.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,638.50 : 3,957.75 = 690.66 : x
  2. Step 2: Convert to fraction form
    2,638.50/3,957.75 = 690.66/x
  3. Step 3: Cross multiply
    2,638.50x = 3,957.75 × 690.66
  4. Step 4: Simplify right side
    2,638.50x = 2,733,459.62
  5. Step 5: Solve for x
    x = 2,733,459.62/2,638.50
  6. Step 6: Final answer
    x = 1,035.99

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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.