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Finding the Fourth Proportional to 780.31, 1,076.84 and 431.00

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Solution

The fourth proportional to 780.31, 1,076.84 and 431.00 is: 594.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    780.31 : 1,076.84 = 431.00 : x
  2. Step 2: Convert to fraction form
    780.31/1,076.84 = 431.00/x
  3. Step 3: Cross multiply
    780.31x = 1,076.84 × 431.00
  4. Step 4: Simplify right side
    780.31x = 464,110.50
  5. Step 5: Solve for x
    x = 464,110.50/780.31
  6. Step 6: Final answer
    x = 594.78

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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.