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Finding the Fourth Proportional to 929.37, 1,394.12 and 381.58

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Solution

The fourth proportional to 929.37, 1,394.12 and 381.58 is: 572.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.37 : 1,394.12 = 381.58 : x
  2. Step 2: Convert to fraction form
    929.37/1,394.12 = 381.58/x
  3. Step 3: Cross multiply
    929.37x = 1,394.12 × 381.58
  4. Step 4: Simplify right side
    929.37x = 531,968.31
  5. Step 5: Solve for x
    x = 531,968.31/929.37
  6. Step 6: Final answer
    x = 572.40

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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.