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Finding the Fourth Proportional to 398.16, 549.20 and 260.16

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Solution

The fourth proportional to 398.16, 549.20 and 260.16 is: 358.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.16 : 549.20 = 260.16 : x
  2. Step 2: Convert to fraction form
    398.16/549.20 = 260.16/x
  3. Step 3: Cross multiply
    398.16x = 549.20 × 260.16
  4. Step 4: Simplify right side
    398.16x = 142,879.87
  5. Step 5: Solve for x
    x = 142,879.87/398.16
  6. Step 6: Final answer
    x = 358.85

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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.