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Finding the Fourth Proportional to 931.24, 1,283.31 and 682.64

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Solution

The fourth proportional to 931.24, 1,283.31 and 682.64 is: 940.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.24 : 1,283.31 = 682.64 : x
  2. Step 2: Convert to fraction form
    931.24/1,283.31 = 682.64/x
  3. Step 3: Cross multiply
    931.24x = 1,283.31 × 682.64
  4. Step 4: Simplify right side
    931.24x = 876,037.13
  5. Step 5: Solve for x
    x = 876,037.13/931.24
  6. Step 6: Final answer
    x = 940.72

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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.