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Finding the Fourth Proportional to 940.20, 1,296.62 and 718.74

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Solution

The fourth proportional to 940.20, 1,296.62 and 718.74 is: 991.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    940.20 : 1,296.62 = 718.74 : x
  2. Step 2: Convert to fraction form
    940.20/1,296.62 = 718.74/x
  3. Step 3: Cross multiply
    940.20x = 1,296.62 × 718.74
  4. Step 4: Simplify right side
    940.20x = 931,932.66
  5. Step 5: Solve for x
    x = 931,932.66/940.20
  6. Step 6: Final answer
    x = 991.21

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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.