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Finding the Fourth Proportional to 931.36, 1,399.96 and 750.72

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Solution

The fourth proportional to 931.36, 1,399.96 and 750.72 is: 1,128.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.36 : 1,399.96 = 750.72 : x
  2. Step 2: Convert to fraction form
    931.36/1,399.96 = 750.72/x
  3. Step 3: Cross multiply
    931.36x = 1,399.96 × 750.72
  4. Step 4: Simplify right side
    931.36x = 1,050,977.97
  5. Step 5: Solve for x
    x = 1,050,977.97/931.36
  6. Step 6: Final answer
    x = 1,128.43

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.