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Finding the Fourth Proportional to 779.97, 1,076.31 and 430.66

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Solution

The fourth proportional to 779.97, 1,076.31 and 430.66 is: 594.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    779.97 : 1,076.31 = 430.66 : x
  2. Step 2: Convert to fraction form
    779.97/1,076.31 = 430.66/x
  3. Step 3: Cross multiply
    779.97x = 1,076.31 × 430.66
  4. Step 4: Simplify right side
    779.97x = 463,523.66
  5. Step 5: Solve for x
    x = 463,523.66/779.97
  6. Step 6: Final answer
    x = 594.28

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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.