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Finding the Fourth Proportional to 929.37, 1,394.20 and 381.40

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Solution

The fourth proportional to 929.37, 1,394.20 and 381.40 is: 572.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.37 : 1,394.20 = 381.40 : x
  2. Step 2: Convert to fraction form
    929.37/1,394.20 = 381.40/x
  3. Step 3: Cross multiply
    929.37x = 1,394.20 × 381.40
  4. Step 4: Simplify right side
    929.37x = 531,747.88
  5. Step 5: Solve for x
    x = 531,747.88/929.37
  6. Step 6: Final answer
    x = 572.16

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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.