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Finding the Fourth Proportional to 528.56, 729.34 and 318.59

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Solution

The fourth proportional to 528.56, 729.34 and 318.59 is: 439.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.56 : 729.34 = 318.59 : x
  2. Step 2: Convert to fraction form
    528.56/729.34 = 318.59/x
  3. Step 3: Cross multiply
    528.56x = 729.34 × 318.59
  4. Step 4: Simplify right side
    528.56x = 232,361.46
  5. Step 5: Solve for x
    x = 232,361.46/528.56
  6. Step 6: Final answer
    x = 439.61

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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.