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Finding the Fourth Proportional to 528.59, 729.36 and 318.76

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Solution

The fourth proportional to 528.59, 729.36 and 318.76 is: 439.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.59 : 729.36 = 318.76 : x
  2. Step 2: Convert to fraction form
    528.59/729.36 = 318.76/x
  3. Step 3: Cross multiply
    528.59x = 729.36 × 318.76
  4. Step 4: Simplify right side
    528.59x = 232,488.97
  5. Step 5: Solve for x
    x = 232,488.97/528.59
  6. Step 6: Final answer
    x = 439.83

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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.