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Finding the Fourth Proportional to 1,185.64, 1,634.70 and 891.88

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Solution

The fourth proportional to 1,185.64, 1,634.70 and 891.88 is: 1,229.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,185.64 : 1,634.70 = 891.88 : x
  2. Step 2: Convert to fraction form
    1,185.64/1,634.70 = 891.88/x
  3. Step 3: Cross multiply
    1,185.64x = 1,634.70 × 891.88
  4. Step 4: Simplify right side
    1,185.64x = 1,457,956.24
  5. Step 5: Solve for x
    x = 1,457,956.24/1,185.64
  6. Step 6: Final answer
    x = 1,229.68

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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.