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Finding the Fourth Proportional to 573.60, 859.20 and 428.88

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Solution

The fourth proportional to 573.60, 859.20 and 428.88 is: 642.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    573.60 : 859.20 = 428.88 : x
  2. Step 2: Convert to fraction form
    573.60/859.20 = 428.88/x
  3. Step 3: Cross multiply
    573.60x = 859.20 × 428.88
  4. Step 4: Simplify right side
    573.60x = 368,493.70
  5. Step 5: Solve for x
    x = 368,493.70/573.60
  6. Step 6: Final answer
    x = 642.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.