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Finding the Fourth Proportional to 779.83, 1,076.09 and 484.87

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Solution

The fourth proportional to 779.83, 1,076.09 and 484.87 is: 669.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.83 : 1,076.09 = 484.87 : x
  2. Step 2: Convert to fraction form
    779.83/1,076.09 = 484.87/x
  3. Step 3: Cross multiply
    779.83x = 1,076.09 × 484.87
  4. Step 4: Simplify right side
    779.83x = 521,760.46
  5. Step 5: Solve for x
    x = 521,760.46/779.83
  6. Step 6: Final answer
    x = 669.07

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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.