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Finding the Fourth Proportional to 1,186.64, 1,636.58 and 891.40

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Solution

The fourth proportional to 1,186.64, 1,636.58 and 891.40 is: 1,229.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,186.64 : 1,636.58 = 891.40 : x
  2. Step 2: Convert to fraction form
    1,186.64/1,636.58 = 891.40/x
  3. Step 3: Cross multiply
    1,186.64x = 1,636.58 × 891.40
  4. Step 4: Simplify right side
    1,186.64x = 1,458,847.41
  5. Step 5: Solve for x
    x = 1,458,847.41/1,186.64
  6. Step 6: Final answer
    x = 1,229.39

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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.