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Finding the Fourth Proportional to 900.96, 1,242.96 and 839.20

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Solution

The fourth proportional to 900.96, 1,242.96 and 839.20 is: 1,157.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    900.96 : 1,242.96 = 839.20 : x
  2. Step 2: Convert to fraction form
    900.96/1,242.96 = 839.20/x
  3. Step 3: Cross multiply
    900.96x = 1,242.96 × 839.20
  4. Step 4: Simplify right side
    900.96x = 1,043,092.03
  5. Step 5: Solve for x
    x = 1,043,092.03/900.96
  6. Step 6: Final answer
    x = 1,157.76

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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.