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Finding the Fourth Proportional to 710.73, 1,063.40 and 638.79

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Solution

The fourth proportional to 710.73, 1,063.40 and 638.79 is: 955.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.73 : 1,063.40 = 638.79 : x
  2. Step 2: Convert to fraction form
    710.73/1,063.40 = 638.79/x
  3. Step 3: Cross multiply
    710.73x = 1,063.40 × 638.79
  4. Step 4: Simplify right side
    710.73x = 679,286.09
  5. Step 5: Solve for x
    x = 679,286.09/710.73
  6. Step 6: Final answer
    x = 955.76

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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.