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Finding the Fourth Proportional to 2,315.99, 3,474.39 and 855.15

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Solution

The fourth proportional to 2,315.99, 3,474.39 and 855.15 is: 1,282.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,315.99 : 3,474.39 = 855.15 : x
  2. Step 2: Convert to fraction form
    2,315.99/3,474.39 = 855.15/x
  3. Step 3: Cross multiply
    2,315.99x = 3,474.39 × 855.15
  4. Step 4: Simplify right side
    2,315.99x = 2,971,124.61
  5. Step 5: Solve for x
    x = 2,971,124.61/2,315.99
  6. Step 6: Final answer
    x = 1,282.88

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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.