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Finding the Fourth Proportional to 1,296.72, 1,788.21 and 1,047.87

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Solution

The fourth proportional to 1,296.72, 1,788.21 and 1,047.87 is: 1,445.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,296.72 : 1,788.21 = 1,047.87 : x
  2. Step 2: Convert to fraction form
    1,296.72/1,788.21 = 1,047.87/x
  3. Step 3: Cross multiply
    1,296.72x = 1,788.21 × 1,047.87
  4. Step 4: Simplify right side
    1,296.72x = 1,873,811.61
  5. Step 5: Solve for x
    x = 1,873,811.61/1,296.72
  6. Step 6: Final answer
    x = 1,445.04

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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.