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Finding the Fourth Proportional to 398.20, 548.76 and 346.36

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Solution

The fourth proportional to 398.20, 548.76 and 346.36 is: 477.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.20 : 548.76 = 346.36 : x
  2. Step 2: Convert to fraction form
    398.20/548.76 = 346.36/x
  3. Step 3: Cross multiply
    398.20x = 548.76 × 346.36
  4. Step 4: Simplify right side
    398.20x = 190,068.51
  5. Step 5: Solve for x
    x = 190,068.51/398.20
  6. Step 6: Final answer
    x = 477.32

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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.