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Finding the Fourth Proportional to 991.25, 1,369.07 and 659.10

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Solution

The fourth proportional to 991.25, 1,369.07 and 659.10 is: 910.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    991.25 : 1,369.07 = 659.10 : x
  2. Step 2: Convert to fraction form
    991.25/1,369.07 = 659.10/x
  3. Step 3: Cross multiply
    991.25x = 1,369.07 × 659.10
  4. Step 4: Simplify right side
    991.25x = 902,343.90
  5. Step 5: Solve for x
    x = 902,343.90/991.25
  6. Step 6: Final answer
    x = 910.31

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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.