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Finding the Fourth Proportional to 538.39, 742.95 and 305.50

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Solution

The fourth proportional to 538.39, 742.95 and 305.50 is: 421.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    538.39 : 742.95 = 305.50 : x
  2. Step 2: Convert to fraction form
    538.39/742.95 = 305.50/x
  3. Step 3: Cross multiply
    538.39x = 742.95 × 305.50
  4. Step 4: Simplify right side
    538.39x = 226,971.23
  5. Step 5: Solve for x
    x = 226,971.23/538.39
  6. Step 6: Final answer
    x = 421.57

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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.