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Finding the Fourth Proportional to 572.40, 789.89 and 320.31

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Solution

The fourth proportional to 572.40, 789.89 and 320.31 is: 442.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.40 : 789.89 = 320.31 : x
  2. Step 2: Convert to fraction form
    572.40/789.89 = 320.31/x
  3. Step 3: Cross multiply
    572.40x = 789.89 × 320.31
  4. Step 4: Simplify right side
    572.40x = 253,009.66
  5. Step 5: Solve for x
    x = 253,009.66/572.40
  6. Step 6: Final answer
    x = 442.02

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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.