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Finding the Fourth Proportional to 528.59, 729.21 and 351.65

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Solution

The fourth proportional to 528.59, 729.21 and 351.65 is: 485.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.59 : 729.21 = 351.65 : x
  2. Step 2: Convert to fraction form
    528.59/729.21 = 351.65/x
  3. Step 3: Cross multiply
    528.59x = 729.21 × 351.65
  4. Step 4: Simplify right side
    528.59x = 256,423.05
  5. Step 5: Solve for x
    x = 256,423.05/528.59
  6. Step 6: Final answer
    x = 485.11

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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.