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Finding the Fourth Proportional to 1,158.60, 1,728.42 and 996.60

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Solution

The fourth proportional to 1,158.60, 1,728.42 and 996.60 is: 1,486.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,158.60 : 1,728.42 = 996.60 : x
  2. Step 2: Convert to fraction form
    1,158.60/1,728.42 = 996.60/x
  3. Step 3: Cross multiply
    1,158.60x = 1,728.42 × 996.60
  4. Step 4: Simplify right side
    1,158.60x = 1,722,543.37
  5. Step 5: Solve for x
    x = 1,722,543.37/1,158.60
  6. Step 6: Final answer
    x = 1,486.75

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.