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Finding the Fourth Proportional to 930.96, 1,396.62 and 520.68

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Solution

The fourth proportional to 930.96, 1,396.62 and 520.68 is: 781.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    930.96 : 1,396.62 = 520.68 : x
  2. Step 2: Convert to fraction form
    930.96/1,396.62 = 520.68/x
  3. Step 3: Cross multiply
    930.96x = 1,396.62 × 520.68
  4. Step 4: Simplify right side
    930.96x = 727,192.10
  5. Step 5: Solve for x
    x = 727,192.10/930.96
  6. Step 6: Final answer
    x = 781.12

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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.