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Finding the Fourth Proportional to 681.20, 955.60 and 681.20

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Solution

The fourth proportional to 681.20, 955.60 and 681.20 is: 955.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.20 : 955.60 = 681.20 : x
  2. Step 2: Convert to fraction form
    681.20/955.60 = 681.20/x
  3. Step 3: Cross multiply
    681.20x = 955.60 × 681.20
  4. Step 4: Simplify right side
    681.20x = 650,954.72
  5. Step 5: Solve for x
    x = 650,954.72/681.20
  6. Step 6: Final answer
    x = 955.60

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.