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Finding the Fourth Proportional to 2,645.93, 3,968.85 and 891.32

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Solution

The fourth proportional to 2,645.93, 3,968.85 and 891.32 is: 1,336.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,645.93 : 3,968.85 = 891.32 : x
  2. Step 2: Convert to fraction form
    2,645.93/3,968.85 = 891.32/x
  3. Step 3: Cross multiply
    2,645.93x = 3,968.85 × 891.32
  4. Step 4: Simplify right side
    2,645.93x = 3,537,495.54
  5. Step 5: Solve for x
    x = 3,537,495.54/2,645.93
  6. Step 6: Final answer
    x = 1,336.96

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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.