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Finding the Fourth Proportional to 1,008.26, 1,392.08 and 659.55

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Solution

The fourth proportional to 1,008.26, 1,392.08 and 659.55 is: 910.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.26 : 1,392.08 = 659.55 : x
  2. Step 2: Convert to fraction form
    1,008.26/1,392.08 = 659.55/x
  3. Step 3: Cross multiply
    1,008.26x = 1,392.08 × 659.55
  4. Step 4: Simplify right side
    1,008.26x = 918,143.07
  5. Step 5: Solve for x
    x = 918,143.07/1,008.26
  6. Step 6: Final answer
    x = 910.63

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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.