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Finding the Fourth Proportional to 398.45, 549.71 and 293.79

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Solution

The fourth proportional to 398.45, 549.71 and 293.79 is: 405.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.45 : 549.71 = 293.79 : x
  2. Step 2: Convert to fraction form
    398.45/549.71 = 293.79/x
  3. Step 3: Cross multiply
    398.45x = 549.71 × 293.79
  4. Step 4: Simplify right side
    398.45x = 161,499.24
  5. Step 5: Solve for x
    x = 161,499.24/398.45
  6. Step 6: Final answer
    x = 405.32

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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.