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Finding the Fourth Proportional to 789.68, 1,089.38 and 474.80

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Solution

The fourth proportional to 789.68, 1,089.38 and 474.80 is: 654.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.68 : 1,089.38 = 474.80 : x
  2. Step 2: Convert to fraction form
    789.68/1,089.38 = 474.80/x
  3. Step 3: Cross multiply
    789.68x = 1,089.38 × 474.80
  4. Step 4: Simplify right side
    789.68x = 517,233.36
  5. Step 5: Solve for x
    x = 517,233.36/789.68
  6. Step 6: Final answer
    x = 654.99

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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.