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Finding the Fourth Proportional to 422.40, 583.20 and 364.80

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Solution

The fourth proportional to 422.40, 583.20 and 364.80 is: 503.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.40 : 583.20 = 364.80 : x
  2. Step 2: Convert to fraction form
    422.40/583.20 = 364.80/x
  3. Step 3: Cross multiply
    422.40x = 583.20 × 364.80
  4. Step 4: Simplify right side
    422.40x = 212,751.36
  5. Step 5: Solve for x
    x = 212,751.36/422.40
  6. Step 6: Final answer
    x = 503.67

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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.