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Finding the Fourth Proportional to 1,728.78, 2,593.58 and 688.84

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Solution

The fourth proportional to 1,728.78, 2,593.58 and 688.84 is: 1,033.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,728.78 : 2,593.58 = 688.84 : x
  2. Step 2: Convert to fraction form
    1,728.78/2,593.58 = 688.84/x
  3. Step 3: Cross multiply
    1,728.78x = 2,593.58 × 688.84
  4. Step 4: Simplify right side
    1,728.78x = 1,786,561.65
  5. Step 5: Solve for x
    x = 1,786,561.65/1,728.78
  6. Step 6: Final answer
    x = 1,033.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.