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Finding the Fourth Proportional to 1,008.08, 1,391.28 and 659.80

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Solution

The fourth proportional to 1,008.08, 1,391.28 and 659.80 is: 910.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.08 : 1,391.28 = 659.80 : x
  2. Step 2: Convert to fraction form
    1,008.08/1,391.28 = 659.80/x
  3. Step 3: Cross multiply
    1,008.08x = 1,391.28 × 659.80
  4. Step 4: Simplify right side
    1,008.08x = 917,966.54
  5. Step 5: Solve for x
    x = 917,966.54/1,008.08
  6. Step 6: Final answer
    x = 910.61

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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.