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Finding the Fourth Proportional to 1,611.45, 2,416.56 and 687.44

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Solution

The fourth proportional to 1,611.45, 2,416.56 and 687.44 is: 1,030.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,611.45 : 2,416.56 = 687.44 : x
  2. Step 2: Convert to fraction form
    1,611.45/2,416.56 = 687.44/x
  3. Step 3: Cross multiply
    1,611.45x = 2,416.56 × 687.44
  4. Step 4: Simplify right side
    1,611.45x = 1,661,227.92
  5. Step 5: Solve for x
    x = 1,661,227.92/1,611.45
  6. Step 6: Final answer
    x = 1,030.89

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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.