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Finding the Fourth Proportional to 1,305.68, 1,959.20 and 656.60

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Solution

The fourth proportional to 1,305.68, 1,959.20 and 656.60 is: 985.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,305.68 : 1,959.20 = 656.60 : x
  2. Step 2: Convert to fraction form
    1,305.68/1,959.20 = 656.60/x
  3. Step 3: Cross multiply
    1,305.68x = 1,959.20 × 656.60
  4. Step 4: Simplify right side
    1,305.68x = 1,286,410.72
  5. Step 5: Solve for x
    x = 1,286,410.72/1,305.68
  6. Step 6: Final answer
    x = 985.24

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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.