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Finding the Fourth Proportional to 1,078.98, 1,489.08 and 659.40

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Solution

The fourth proportional to 1,078.98, 1,489.08 and 659.40 is: 910.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,078.98 : 1,489.08 = 659.40 : x
  2. Step 2: Convert to fraction form
    1,078.98/1,489.08 = 659.40/x
  3. Step 3: Cross multiply
    1,078.98x = 1,489.08 × 659.40
  4. Step 4: Simplify right side
    1,078.98x = 981,899.35
  5. Step 5: Solve for x
    x = 981,899.35/1,078.98
  6. Step 6: Final answer
    x = 910.03

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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.