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Finding the Fourth Proportional to 660.54, 991.16 and 479.43

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Solution

The fourth proportional to 660.54, 991.16 and 479.43 is: 719.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    660.54 : 991.16 = 479.43 : x
  2. Step 2: Convert to fraction form
    660.54/991.16 = 479.43/x
  3. Step 3: Cross multiply
    660.54x = 991.16 × 479.43
  4. Step 4: Simplify right side
    660.54x = 475,189.44
  5. Step 5: Solve for x
    x = 475,189.44/660.54
  6. Step 6: Final answer
    x = 719.40

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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.