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Finding the Fourth Proportional to 337.80, 505.80 and 215.40

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Solution

The fourth proportional to 337.80, 505.80 and 215.40 is: 322.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    337.80 : 505.80 = 215.40 : x
  2. Step 2: Convert to fraction form
    337.80/505.80 = 215.40/x
  3. Step 3: Cross multiply
    337.80x = 505.80 × 215.40
  4. Step 4: Simplify right side
    337.80x = 108,949.32
  5. Step 5: Solve for x
    x = 108,949.32/337.80
  6. Step 6: Final answer
    x = 322.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.