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Finding the Fourth Proportional to 676.40, 932.51 and 528.80

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Solution

The fourth proportional to 676.40, 932.51 and 528.80 is: 729.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    676.40 : 932.51 = 528.80 : x
  2. Step 2: Convert to fraction form
    676.40/932.51 = 528.80/x
  3. Step 3: Cross multiply
    676.40x = 932.51 × 528.80
  4. Step 4: Simplify right side
    676.40x = 493,107.95
  5. Step 5: Solve for x
    x = 493,107.95/676.40
  6. Step 6: Final answer
    x = 729.02

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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.