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Finding the Fourth Proportional to 572.40, 789.80 and 339.60

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Solution

The fourth proportional to 572.40, 789.80 and 339.60 is: 468.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    572.40 : 789.80 = 339.60 : x
  2. Step 2: Convert to fraction form
    572.40/789.80 = 339.60/x
  3. Step 3: Cross multiply
    572.40x = 789.80 × 339.60
  4. Step 4: Simplify right side
    572.40x = 268,216.08
  5. Step 5: Solve for x
    x = 268,216.08/572.40
  6. Step 6: Final answer
    x = 468.58

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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.