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Finding the Fourth Proportional to 1,405.74, 2,108.94 and 995.68

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Solution

The fourth proportional to 1,405.74, 2,108.94 and 995.68 is: 1,493.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,405.74 : 2,108.94 = 995.68 : x
  2. Step 2: Convert to fraction form
    1,405.74/2,108.94 = 995.68/x
  3. Step 3: Cross multiply
    1,405.74x = 2,108.94 × 995.68
  4. Step 4: Simplify right side
    1,405.74x = 2,099,829.38
  5. Step 5: Solve for x
    x = 2,099,829.38/1,405.74
  6. Step 6: Final answer
    x = 1,493.75

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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.