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Finding the Fourth Proportional to 949.62, 1,311.08 and 728.16

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Solution

The fourth proportional to 949.62, 1,311.08 and 728.16 is: 1,005.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.62 : 1,311.08 = 728.16 : x
  2. Step 2: Convert to fraction form
    949.62/1,311.08 = 728.16/x
  3. Step 3: Cross multiply
    949.62x = 1,311.08 × 728.16
  4. Step 4: Simplify right side
    949.62x = 954,676.01
  5. Step 5: Solve for x
    x = 954,676.01/949.62
  6. Step 6: Final answer
    x = 1,005.32

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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.