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Finding the Fourth Proportional to 1,281.00, 1,767.78 and 721.48

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Solution

The fourth proportional to 1,281.00, 1,767.78 and 721.48 is: 995.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,281.00 : 1,767.78 = 721.48 : x
  2. Step 2: Convert to fraction form
    1,281.00/1,767.78 = 721.48/x
  3. Step 3: Cross multiply
    1,281.00x = 1,767.78 × 721.48
  4. Step 4: Simplify right side
    1,281.00x = 1,275,411.10
  5. Step 5: Solve for x
    x = 1,275,411.10/1,281.00
  6. Step 6: Final answer
    x = 995.64

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.