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Finding the Fourth Proportional to 1,328.00, 1,992.80 and 1,247.00

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Solution

The fourth proportional to 1,328.00, 1,992.80 and 1,247.00 is: 1,871.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,328.00 : 1,992.80 = 1,247.00 : x
  2. Step 2: Convert to fraction form
    1,328.00/1,992.80 = 1,247.00/x
  3. Step 3: Cross multiply
    1,328.00x = 1,992.80 × 1,247.00
  4. Step 4: Simplify right side
    1,328.00x = 2,485,014.75
  5. Step 5: Solve for x
    x = 2,485,014.75/1,328.00
  6. Step 6: Final answer
    x = 1,871.25

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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.