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Finding the Fourth Proportional to 2,638.98, 3,958.47 and 691.13

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Solution

The fourth proportional to 2,638.98, 3,958.47 and 691.13 is: 1,036.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,638.98 : 3,958.47 = 691.13 : x
  2. Step 2: Convert to fraction form
    2,638.98/3,958.47 = 691.13/x
  3. Step 3: Cross multiply
    2,638.98x = 3,958.47 × 691.13
  4. Step 4: Simplify right side
    2,638.98x = 2,735,827.27
  5. Step 5: Solve for x
    x = 2,735,827.27/2,638.98
  6. Step 6: Final answer
    x = 1,036.70

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1.5x scale

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.