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Finding the Fourth Proportional to 1,245.10, 1,717.92 and 720.82

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Solution

The fourth proportional to 1,245.10, 1,717.92 and 720.82 is: 994.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.10 : 1,717.92 = 720.82 : x
  2. Step 2: Convert to fraction form
    1,245.10/1,717.92 = 720.82/x
  3. Step 3: Cross multiply
    1,245.10x = 1,717.92 × 720.82
  4. Step 4: Simplify right side
    1,245.10x = 1,238,311.09
  5. Step 5: Solve for x
    x = 1,238,311.09/1,245.10
  6. Step 6: Final answer
    x = 994.55

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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.