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Finding the Fourth Proportional to 779.64, 1,076.31 and 500.28

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Solution

The fourth proportional to 779.64, 1,076.31 and 500.28 is: 690.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.64 : 1,076.31 = 500.28 : x
  2. Step 2: Convert to fraction form
    779.64/1,076.31 = 500.28/x
  3. Step 3: Cross multiply
    779.64x = 1,076.31 × 500.28
  4. Step 4: Simplify right side
    779.64x = 538,456.37
  5. Step 5: Solve for x
    x = 538,456.37/779.64
  6. Step 6: Final answer
    x = 690.65

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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.