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Finding the Fourth Proportional to 741.87, 1,017.14 and 728.70

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Solution

The fourth proportional to 741.87, 1,017.14 and 728.70 is: 999.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    741.87 : 1,017.14 = 728.70 : x
  2. Step 2: Convert to fraction form
    741.87/1,017.14 = 728.70/x
  3. Step 3: Cross multiply
    741.87x = 1,017.14 × 728.70
  4. Step 4: Simplify right side
    741.87x = 741,189.92
  5. Step 5: Solve for x
    x = 741,189.92/741.87
  6. Step 6: Final answer
    x = 999.08

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.