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Finding the Fourth Proportional to 613.95, 847.23 and 392.98

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Solution

The fourth proportional to 613.95, 847.23 and 392.98 is: 542.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.95 : 847.23 = 392.98 : x
  2. Step 2: Convert to fraction form
    613.95/847.23 = 392.98/x
  3. Step 3: Cross multiply
    613.95x = 847.23 × 392.98
  4. Step 4: Simplify right side
    613.95x = 332,943.38
  5. Step 5: Solve for x
    x = 332,943.38/613.95
  6. Step 6: Final answer
    x = 542.29

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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.