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Finding the Fourth Proportional to 1,008.91, 1,512.69 and 392.67

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Solution

The fourth proportional to 1,008.91, 1,512.69 and 392.67 is: 588.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,008.91 : 1,512.69 = 392.67 : x
  2. Step 2: Convert to fraction form
    1,008.91/1,512.69 = 392.67/x
  3. Step 3: Cross multiply
    1,008.91x = 1,512.69 × 392.67
  4. Step 4: Simplify right side
    1,008.91x = 593,991.32
  5. Step 5: Solve for x
    x = 593,991.32/1,008.91
  6. Step 6: Final answer
    x = 588.75

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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.