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Finding the Fourth Proportional to 512.88, 708.08 and 402.09

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Solution

The fourth proportional to 512.88, 708.08 and 402.09 is: 555.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.88 : 708.08 = 402.09 : x
  2. Step 2: Convert to fraction form
    512.88/708.08 = 402.09/x
  3. Step 3: Cross multiply
    512.88x = 708.08 × 402.09
  4. Step 4: Simplify right side
    512.88x = 284,711.89
  5. Step 5: Solve for x
    x = 284,711.89/512.88
  6. Step 6: Final answer
    x = 555.12

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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.