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Finding the Fourth Proportional to 949.55, 1,309.91 and 728.12

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Solution

The fourth proportional to 949.55, 1,309.91 and 728.12 is: 1,004.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    949.55 : 1,309.91 = 728.12 : x
  2. Step 2: Convert to fraction form
    949.55/1,309.91 = 728.12/x
  3. Step 3: Cross multiply
    949.55x = 1,309.91 × 728.12
  4. Step 4: Simplify right side
    949.55x = 953,771.30
  5. Step 5: Solve for x
    x = 953,771.30/949.55
  6. Step 6: Final answer
    x = 1,004.45

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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.