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Finding the Fourth Proportional to 1,728.19, 2,592.30 and 687.73

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Solution

The fourth proportional to 1,728.19, 2,592.30 and 687.73 is: 1,031.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,728.19 : 2,592.30 = 687.73 : x
  2. Step 2: Convert to fraction form
    1,728.19/2,592.30 = 687.73/x
  3. Step 3: Cross multiply
    1,728.19x = 2,592.30 × 687.73
  4. Step 4: Simplify right side
    1,728.19x = 1,782,802.48
  5. Step 5: Solve for x
    x = 1,782,802.48/1,728.19
  6. Step 6: Final answer
    x = 1,031.60

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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.