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Finding the Fourth Proportional to 929.13, 1,392.87 and 381.21

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Solution

The fourth proportional to 929.13, 1,392.87 and 381.21 is: 571.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    929.13 : 1,392.87 = 381.21 : x
  2. Step 2: Convert to fraction form
    929.13/1,392.87 = 381.21/x
  3. Step 3: Cross multiply
    929.13x = 1,392.87 × 381.21
  4. Step 4: Simplify right side
    929.13x = 530,975.97
  5. Step 5: Solve for x
    x = 530,975.97/929.13
  6. Step 6: Final answer
    x = 571.48

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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.