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Finding the Fourth Proportional to 931.80, 1,396.86 and 383.64

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Solution

The fourth proportional to 931.80, 1,396.86 and 383.64 is: 575.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.80 : 1,396.86 = 383.64 : x
  2. Step 2: Convert to fraction form
    931.80/1,396.86 = 383.64/x
  3. Step 3: Cross multiply
    931.80x = 1,396.86 × 383.64
  4. Step 4: Simplify right side
    931.80x = 535,891.37
  5. Step 5: Solve for x
    x = 535,891.37/931.80
  6. Step 6: Final answer
    x = 575.11

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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.