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Finding the Fourth Proportional to 1,205.70, 1,663.85 and 681.70

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Solution

The fourth proportional to 1,205.70, 1,663.85 and 681.70 is: 940.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.70 : 1,663.85 = 681.70 : x
  2. Step 2: Convert to fraction form
    1,205.70/1,663.85 = 681.70/x
  3. Step 3: Cross multiply
    1,205.70x = 1,663.85 × 681.70
  4. Step 4: Simplify right side
    1,205.70x = 1,134,244.09
  5. Step 5: Solve for x
    x = 1,134,244.09/1,205.70
  6. Step 6: Final answer
    x = 940.73

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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.