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Finding the Fourth Proportional to 931.67, 1,395.68 and 639.12

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Solution

The fourth proportional to 931.67, 1,395.68 and 639.12 is: 957.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.67 : 1,395.68 = 639.12 : x
  2. Step 2: Convert to fraction form
    931.67/1,395.68 = 639.12/x
  3. Step 3: Cross multiply
    931.67x = 1,395.68 × 639.12
  4. Step 4: Simplify right side
    931.67x = 892,003.81
  5. Step 5: Solve for x
    x = 892,003.81/931.67
  6. Step 6: Final answer
    x = 957.43

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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.