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Finding the Fourth Proportional to 665.60, 996.60 and 521.60

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Solution

The fourth proportional to 665.60, 996.60 and 521.60 is: 780.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    665.60 : 996.60 = 521.60 : x
  2. Step 2: Convert to fraction form
    665.60/996.60 = 521.60/x
  3. Step 3: Cross multiply
    665.60x = 996.60 × 521.60
  4. Step 4: Simplify right side
    665.60x = 519,826.56
  5. Step 5: Solve for x
    x = 519,826.56/665.60
  6. Step 6: Final answer
    x = 780.99

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.