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Finding the Fourth Proportional to 995.77, 1,374.39 and 645.85

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Solution

The fourth proportional to 995.77, 1,374.39 and 645.85 is: 891.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    995.77 : 1,374.39 = 645.85 : x
  2. Step 2: Convert to fraction form
    995.77/1,374.39 = 645.85/x
  3. Step 3: Cross multiply
    995.77x = 1,374.39 × 645.85
  4. Step 4: Simplify right side
    995.77x = 887,639.68
  5. Step 5: Solve for x
    x = 887,639.68/995.77
  6. Step 6: Final answer
    x = 891.41

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.