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Finding the Fourth Proportional to 1,247.99, 1,871.39 and 728.15

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Solution

The fourth proportional to 1,247.99, 1,871.39 and 728.15 is: 1,091.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,247.99 : 1,871.39 = 728.15 : x
  2. Step 2: Convert to fraction form
    1,247.99/1,871.39 = 728.15/x
  3. Step 3: Cross multiply
    1,247.99x = 1,871.39 × 728.15
  4. Step 4: Simplify right side
    1,247.99x = 1,362,641.00
  5. Step 5: Solve for x
    x = 1,362,641.00/1,247.99
  6. Step 6: Final answer
    x = 1,091.87

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.