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Finding the Fourth Proportional to 613.85, 847.05 and 392.72

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Solution

The fourth proportional to 613.85, 847.05 and 392.72 is: 541.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.85 : 847.05 = 392.72 : x
  2. Step 2: Convert to fraction form
    613.85/847.05 = 392.72/x
  3. Step 3: Cross multiply
    613.85x = 847.05 × 392.72
  4. Step 4: Simplify right side
    613.85x = 332,649.24
  5. Step 5: Solve for x
    x = 332,649.24/613.85
  6. Step 6: Final answer
    x = 541.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.