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Finding the Fourth Proportional to 398.37, 549.21 and 392.91

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Solution

The fourth proportional to 398.37, 549.21 and 392.91 is: 541.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.37 : 549.21 = 392.91 : x
  2. Step 2: Convert to fraction form
    398.37/549.21 = 392.91/x
  3. Step 3: Cross multiply
    398.37x = 549.21 × 392.91
  4. Step 4: Simplify right side
    398.37x = 215,790.10
  5. Step 5: Solve for x
    x = 215,790.10/398.37
  6. Step 6: Final answer
    x = 541.68

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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.