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Finding the Fourth Proportional to 528.12, 729.05 and 351.40

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Solution

The fourth proportional to 528.12, 729.05 and 351.40 is: 485.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    528.12 : 729.05 = 351.40 : x
  2. Step 2: Convert to fraction form
    528.12/729.05 = 351.40/x
  3. Step 3: Cross multiply
    528.12x = 729.05 × 351.40
  4. Step 4: Simplify right side
    528.12x = 256,184.90
  5. Step 5: Solve for x
    x = 256,184.90/528.12
  6. Step 6: Final answer
    x = 485.09

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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.