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Finding the Fourth Proportional to 2,686.54, 4,029.62 and 931.12

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Solution

The fourth proportional to 2,686.54, 4,029.62 and 931.12 is: 1,396.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,686.54 : 4,029.62 = 931.12 : x
  2. Step 2: Convert to fraction form
    2,686.54/4,029.62 = 931.12/x
  3. Step 3: Cross multiply
    2,686.54x = 4,029.62 × 931.12
  4. Step 4: Simplify right side
    2,686.54x = 3,752,064.23
  5. Step 5: Solve for x
    x = 3,752,064.23/2,686.54
  6. Step 6: Final answer
    x = 1,396.61

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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.