Home / 2,638.12-3,957.18-690.31

Finding the Fourth Proportional to 2,638.12, 3,957.18 and 690.31

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Solution

The fourth proportional to 2,638.12, 3,957.18 and 690.31 is: 1,035.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,638.12 : 3,957.18 = 690.31 : x
  2. Step 2: Convert to fraction form
    2,638.12/3,957.18 = 690.31/x
  3. Step 3: Cross multiply
    2,638.12x = 3,957.18 × 690.31
  4. Step 4: Simplify right side
    2,638.12x = 2,731,671.03
  5. Step 5: Solve for x
    x = 2,731,671.03/2,638.12
  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.