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Finding the Fourth Proportional to 613.18, 845.76 and 392.02

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Solution

The fourth proportional to 613.18, 845.76 and 392.02 is: 540.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.18 : 845.76 = 392.02 : x
  2. Step 2: Convert to fraction form
    613.18/845.76 = 392.02/x
  3. Step 3: Cross multiply
    613.18x = 845.76 × 392.02
  4. Step 4: Simplify right side
    613.18x = 331,554.84
  5. Step 5: Solve for x
    x = 331,554.84/613.18
  6. Step 6: Final answer
    x = 540.72

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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.