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Finding the Fourth Proportional to 615.61, 849.64 and 394.55

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Solution

The fourth proportional to 615.61, 849.64 and 394.55 is: 544.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.61 : 849.64 = 394.55 : x
  2. Step 2: Convert to fraction form
    615.61/849.64 = 394.55/x
  3. Step 3: Cross multiply
    615.61x = 849.64 × 394.55
  4. Step 4: Simplify right side
    615.61x = 335,225.46
  5. Step 5: Solve for x
    x = 335,225.46/615.61
  6. Step 6: Final answer
    x = 544.54

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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.