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Finding the Fourth Proportional to 1,245.82, 1,719.21 and 721.84

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Solution

The fourth proportional to 1,245.82, 1,719.21 and 721.84 is: 996.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.82 : 1,719.21 = 721.84 : x
  2. Step 2: Convert to fraction form
    1,245.82/1,719.21 = 721.84/x
  3. Step 3: Cross multiply
    1,245.82x = 1,719.21 × 721.84
  4. Step 4: Simplify right side
    1,245.82x = 1,240,994.55
  5. Step 5: Solve for x
    x = 1,240,994.55/1,245.82
  6. Step 6: Final answer
    x = 996.13

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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.