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Finding the Fourth Proportional to 905.12, 1,358.22 and 392.12

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Solution

The fourth proportional to 905.12, 1,358.22 and 392.12 is: 588.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.12 : 1,358.22 = 392.12 : x
  2. Step 2: Convert to fraction form
    905.12/1,358.22 = 392.12/x
  3. Step 3: Cross multiply
    905.12x = 1,358.22 × 392.12
  4. Step 4: Simplify right side
    905.12x = 532,585.23
  5. Step 5: Solve for x
    x = 532,585.23/905.12
  6. Step 6: Final answer
    x = 588.41

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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.