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Finding the Fourth Proportional to 789.19, 1,089.30 and 568.78

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Solution

The fourth proportional to 789.19, 1,089.30 and 568.78 is: 785.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.19 : 1,089.30 = 568.78 : x
  2. Step 2: Convert to fraction form
    789.19/1,089.30 = 568.78/x
  3. Step 3: Cross multiply
    789.19x = 1,089.30 × 568.78
  4. Step 4: Simplify right side
    789.19x = 619,572.05
  5. Step 5: Solve for x
    x = 619,572.05/789.19
  6. Step 6: Final answer
    x = 785.07

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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.