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Finding the Fourth Proportional to 1,098.80, 1,515.76 and 656.64

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Solution

The fourth proportional to 1,098.80, 1,515.76 and 656.64 is: 905.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.80 : 1,515.76 = 656.64 : x
  2. Step 2: Convert to fraction form
    1,098.80/1,515.76 = 656.64/x
  3. Step 3: Cross multiply
    1,098.80x = 1,515.76 × 656.64
  4. Step 4: Simplify right side
    1,098.80x = 995,308.65
  5. Step 5: Solve for x
    x = 995,308.65/1,098.80
  6. Step 6: Final answer
    x = 905.81

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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.