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Finding the Fourth Proportional to 789.39, 1,089.47 and 474.55

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Solution

The fourth proportional to 789.39, 1,089.47 and 474.55 is: 654.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    789.39 : 1,089.47 = 474.55 : x
  2. Step 2: Convert to fraction form
    789.39/1,089.47 = 474.55/x
  3. Step 3: Cross multiply
    789.39x = 1,089.47 × 474.55
  4. Step 4: Simplify right side
    789.39x = 517,000.17
  5. Step 5: Solve for x
    x = 517,000.17/789.39
  6. Step 6: Final answer
    x = 654.94

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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.