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Finding the Fourth Proportional to 331.72, 457.80 and 207.40

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Solution

The fourth proportional to 331.72, 457.80 and 207.40 is: 286.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.72 : 457.80 = 207.40 : x
  2. Step 2: Convert to fraction form
    331.72/457.80 = 207.40/x
  3. Step 3: Cross multiply
    331.72x = 457.80 × 207.40
  4. Step 4: Simplify right side
    331.72x = 94,947.72
  5. Step 5: Solve for x
    x = 94,947.72/331.72
  6. Step 6: Final answer
    x = 286.23

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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.