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Finding the Fourth Proportional to 429.60, 642.60 and 364.80

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Solution

The fourth proportional to 429.60, 642.60 and 364.80 is: 545.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.60 : 642.60 = 364.80 : x
  2. Step 2: Convert to fraction form
    429.60/642.60 = 364.80/x
  3. Step 3: Cross multiply
    429.60x = 642.60 × 364.80
  4. Step 4: Simplify right side
    429.60x = 234,420.48
  5. Step 5: Solve for x
    x = 234,420.48/429.60
  6. Step 6: Final answer
    x = 545.67

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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.