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Finding the Fourth Proportional to 931.47, 1,286.31 and 744.36

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Solution

The fourth proportional to 931.47, 1,286.31 and 744.36 is: 1,027.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.47 : 1,286.31 = 744.36 : x
  2. Step 2: Convert to fraction form
    931.47/1,286.31 = 744.36/x
  3. Step 3: Cross multiply
    931.47x = 1,286.31 × 744.36
  4. Step 4: Simplify right side
    931.47x = 957,477.71
  5. Step 5: Solve for x
    x = 957,477.71/931.47
  6. Step 6: Final answer
    x = 1,027.92

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1.5x scale

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.