Home / 2,638.10-3,957.35-690.27

Finding the Fourth Proportional to 2,638.10, 3,957.35 and 690.27

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Solution

The fourth proportional to 2,638.10, 3,957.35 and 690.27 is: 1,035.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,638.10 : 3,957.35 = 690.27 : x
  2. Step 2: Convert to fraction form
    2,638.10/3,957.35 = 690.27/x
  3. Step 3: Cross multiply
    2,638.10x = 3,957.35 × 690.27
  4. Step 4: Simplify right side
    2,638.10x = 2,731,636.53
  5. Step 5: Solve for x
    x = 2,731,636.53/2,638.10
  6. Step 6: Final answer
    x = 1,035.46

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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.