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Finding the Fourth Proportional to 572.22, 789.42 and 383.40

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Solution

The fourth proportional to 572.22, 789.42 and 383.40 is: 528.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.22 : 789.42 = 383.40 : x
  2. Step 2: Convert to fraction form
    572.22/789.42 = 383.40/x
  3. Step 3: Cross multiply
    572.22x = 789.42 × 383.40
  4. Step 4: Simplify right side
    572.22x = 302,663.63
  5. Step 5: Solve for x
    x = 302,663.63/572.22
  6. Step 6: Final answer
    x = 528.93

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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.