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Finding the Fourth Proportional to 528.50, 729.52 and 318.68

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Solution

The fourth proportional to 528.50, 729.52 and 318.68 is: 439.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.50 : 729.52 = 318.68 : x
  2. Step 2: Convert to fraction form
    528.50/729.52 = 318.68/x
  3. Step 3: Cross multiply
    528.50x = 729.52 × 318.68
  4. Step 4: Simplify right side
    528.50x = 232,487.62
  5. Step 5: Solve for x
    x = 232,487.62/528.50
  6. Step 6: Final answer
    x = 439.90

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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.