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Finding the Fourth Proportional to 615.74, 849.51 and 405.86

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Solution

The fourth proportional to 615.74, 849.51 and 405.86 is: 559.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    615.74 : 849.51 = 405.86 : x
  2. Step 2: Convert to fraction form
    615.74/849.51 = 405.86/x
  3. Step 3: Cross multiply
    615.74x = 849.51 × 405.86
  4. Step 4: Simplify right side
    615.74x = 344,777.88
  5. Step 5: Solve for x
    x = 344,777.88/615.74
  6. Step 6: Final answer
    x = 559.94

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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.