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Finding the Fourth Proportional to 789.88, 1,189.09 and 710.50

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Solution

The fourth proportional to 789.88, 1,189.09 and 710.50 is: 1,069.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.88 : 1,189.09 = 710.50 : x
  2. Step 2: Convert to fraction form
    789.88/1,189.09 = 710.50/x
  3. Step 3: Cross multiply
    789.88x = 1,189.09 × 710.50
  4. Step 4: Simplify right side
    789.88x = 844,848.45
  5. Step 5: Solve for x
    x = 844,848.45/789.88
  6. Step 6: Final answer
    x = 1,069.59

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.