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Finding the Fourth Proportional to 527.40, 790.95 and 321.21

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Solution

The fourth proportional to 527.40, 790.95 and 321.21 is: 481.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    527.40 : 790.95 = 321.21 : x
  2. Step 2: Convert to fraction form
    527.40/790.95 = 321.21/x
  3. Step 3: Cross multiply
    527.40x = 790.95 × 321.21
  4. Step 4: Simplify right side
    527.40x = 254,061.05
  5. Step 5: Solve for x
    x = 254,061.05/527.40
  6. Step 6: Final answer
    x = 481.72

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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.