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Finding the Fourth Proportional to 398.17, 548.27 and 315.01

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Solution

The fourth proportional to 398.17, 548.27 and 315.01 is: 433.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.17 : 548.27 = 315.01 : x
  2. Step 2: Convert to fraction form
    398.17/548.27 = 315.01/x
  3. Step 3: Cross multiply
    398.17x = 548.27 × 315.01
  4. Step 4: Simplify right side
    398.17x = 172,707.79
  5. Step 5: Solve for x
    x = 172,707.79/398.17
  6. Step 6: Final answer
    x = 433.76

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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.