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Finding the Fourth Proportional to 710.31, 1,065.09 and 319.97

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Solution

The fourth proportional to 710.31, 1,065.09 and 319.97 is: 479.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.31 : 1,065.09 = 319.97 : x
  2. Step 2: Convert to fraction form
    710.31/1,065.09 = 319.97/x
  3. Step 3: Cross multiply
    710.31x = 1,065.09 × 319.97
  4. Step 4: Simplify right side
    710.31x = 340,796.85
  5. Step 5: Solve for x
    x = 340,796.85/710.31
  6. Step 6: Final answer
    x = 479.79

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.