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Finding the Fourth Proportional to 572.30, 789.80 and 351.20

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Solution

The fourth proportional to 572.30, 789.80 and 351.20 is: 484.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.30 : 789.80 = 351.20 : x
  2. Step 2: Convert to fraction form
    572.30/789.80 = 351.20/x
  3. Step 3: Cross multiply
    572.30x = 789.80 × 351.20
  4. Step 4: Simplify right side
    572.30x = 277,377.76
  5. Step 5: Solve for x
    x = 277,377.76/572.30
  6. Step 6: Final answer
    x = 484.67

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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.