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Finding the Fourth Proportional to 779.79, 1,076.08 and 447.99

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Solution

The fourth proportional to 779.79, 1,076.08 and 447.99 is: 618.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.79 : 1,076.08 = 447.99 : x
  2. Step 2: Convert to fraction form
    779.79/1,076.08 = 447.99/x
  3. Step 3: Cross multiply
    779.79x = 1,076.08 × 447.99
  4. Step 4: Simplify right side
    779.79x = 482,073.08
  5. Step 5: Solve for x
    x = 482,073.08/779.79
  6. Step 6: Final answer
    x = 618.21

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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.