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Finding the Fourth Proportional to 613.68, 846.98 and 392.70

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Solution

The fourth proportional to 613.68, 846.98 and 392.70 is: 541.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.68 : 846.98 = 392.70 : x
  2. Step 2: Convert to fraction form
    613.68/846.98 = 392.70/x
  3. Step 3: Cross multiply
    613.68x = 846.98 × 392.70
  4. Step 4: Simplify right side
    613.68x = 332,608.07
  5. Step 5: Solve for x
    x = 332,608.07/613.68
  6. Step 6: Final answer
    x = 541.99

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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.