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Finding the Fourth Proportional to 613.40, 846.14 and 388.92

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Solution

The fourth proportional to 613.40, 846.14 and 388.92 is: 536.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.40 : 846.14 = 388.92 : x
  2. Step 2: Convert to fraction form
    613.40/846.14 = 388.92/x
  3. Step 3: Cross multiply
    613.40x = 846.14 × 388.92
  4. Step 4: Simplify right side
    613.40x = 329,083.46
  5. Step 5: Solve for x
    x = 329,083.46/613.40
  6. Step 6: Final answer
    x = 536.50

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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.