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Finding the Fourth Proportional to 931.24, 1,286.67 and 775.72

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Solution

The fourth proportional to 931.24, 1,286.67 and 775.72 is: 1,071.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.24 : 1,286.67 = 775.72 : x
  2. Step 2: Convert to fraction form
    931.24/1,286.67 = 775.72/x
  3. Step 3: Cross multiply
    931.24x = 1,286.67 × 775.72
  4. Step 4: Simplify right side
    931.24x = 998,095.81
  5. Step 5: Solve for x
    x = 998,095.81/931.24
  6. Step 6: Final answer
    x = 1,071.79

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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.