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Finding the Fourth Proportional to 245.28, 368.40 and 213.92

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Solution

The fourth proportional to 245.28, 368.40 and 213.92 is: 321.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.28 : 368.40 = 213.92 : x
  2. Step 2: Convert to fraction form
    245.28/368.40 = 213.92/x
  3. Step 3: Cross multiply
    245.28x = 368.40 × 213.92
  4. Step 4: Simplify right side
    245.28x = 78,808.13
  5. Step 5: Solve for x
    x = 78,808.13/245.28
  6. Step 6: Final answer
    x = 321.30

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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.