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Finding the Fourth Proportional to 789.28, 1,089.04 and 568.72

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Solution

The fourth proportional to 789.28, 1,089.04 and 568.72 is: 784.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.28 : 1,089.04 = 568.72 : x
  2. Step 2: Convert to fraction form
    789.28/1,089.04 = 568.72/x
  3. Step 3: Cross multiply
    789.28x = 1,089.04 × 568.72
  4. Step 4: Simplify right side
    789.28x = 619,358.83
  5. Step 5: Solve for x
    x = 619,358.83/789.28
  6. Step 6: Final answer
    x = 784.71

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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.