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Finding the Fourth Proportional to 527.50, 727.95 and 331.21

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Solution

The fourth proportional to 527.50, 727.95 and 331.21 is: 457.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    527.50 : 727.95 = 331.21 : x
  2. Step 2: Convert to fraction form
    527.50/727.95 = 331.21/x
  3. Step 3: Cross multiply
    527.50x = 727.95 × 331.21
  4. Step 4: Simplify right side
    527.50x = 241,104.32
  5. Step 5: Solve for x
    x = 241,104.32/527.50
  6. Step 6: Final answer
    x = 457.07

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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.