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Finding the Fourth Proportional to 931.50, 1,396.31 and 383.99

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Solution

The fourth proportional to 931.50, 1,396.31 and 383.99 is: 575.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    931.50 : 1,396.31 = 383.99 : x
  2. Step 2: Convert to fraction form
    931.50/1,396.31 = 383.99/x
  3. Step 3: Cross multiply
    931.50x = 1,396.31 × 383.99
  4. Step 4: Simplify right side
    931.50x = 536,160.18
  5. Step 5: Solve for x
    x = 536,160.18/931.50
  6. Step 6: Final answer
    x = 575.59

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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.