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Finding the Fourth Proportional to 931.30, 1,396.47 and 639.16

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Solution

The fourth proportional to 931.30, 1,396.47 and 639.16 is: 958.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.30 : 1,396.47 = 639.16 : x
  2. Step 2: Convert to fraction form
    931.30/1,396.47 = 639.16/x
  3. Step 3: Cross multiply
    931.30x = 1,396.47 × 639.16
  4. Step 4: Simplify right side
    931.30x = 892,566.67
  5. Step 5: Solve for x
    x = 892,566.67/931.30
  6. Step 6: Final answer
    x = 958.41

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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.