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Finding the Fourth Proportional to 1,151.80, 1,728.90 and 665.80

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Solution

The fourth proportional to 1,151.80, 1,728.90 and 665.80 is: 999.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,151.80 : 1,728.90 = 665.80 : x
  2. Step 2: Convert to fraction form
    1,151.80/1,728.90 = 665.80/x
  3. Step 3: Cross multiply
    1,151.80x = 1,728.90 × 665.80
  4. Step 4: Simplify right side
    1,151.80x = 1,151,101.62
  5. Step 5: Solve for x
    x = 1,151,101.62/1,151.80
  6. Step 6: Final answer
    x = 999.39

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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.