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Finding the Fourth Proportional to 779.63, 1,076.36 and 517.79

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Solution

The fourth proportional to 779.63, 1,076.36 and 517.79 is: 714.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.63 : 1,076.36 = 517.79 : x
  2. Step 2: Convert to fraction form
    779.63/1,076.36 = 517.79/x
  3. Step 3: Cross multiply
    779.63x = 1,076.36 × 517.79
  4. Step 4: Simplify right side
    779.63x = 557,328.55
  5. Step 5: Solve for x
    x = 557,328.55/779.63
  6. Step 6: Final answer
    x = 714.87

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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.