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Finding the Fourth Proportional to 905.63, 1,358.98 and 392.63

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Solution

The fourth proportional to 905.63, 1,358.98 and 392.63 is: 589.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    905.63 : 1,358.98 = 392.63 : x
  2. Step 2: Convert to fraction form
    905.63/1,358.98 = 392.63/x
  3. Step 3: Cross multiply
    905.63x = 1,358.98 × 392.63
  4. Step 4: Simplify right side
    905.63x = 533,568.54
  5. Step 5: Solve for x
    x = 533,568.54/905.63
  6. Step 6: Final answer
    x = 589.17

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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.