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Finding the Fourth Proportional to 378.02, 521.70 and 220.62

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Solution

The fourth proportional to 378.02, 521.70 and 220.62 is: 304.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.02 : 521.70 = 220.62 : x
  2. Step 2: Convert to fraction form
    378.02/521.70 = 220.62/x
  3. Step 3: Cross multiply
    378.02x = 521.70 × 220.62
  4. Step 4: Simplify right side
    378.02x = 115,097.45
  5. Step 5: Solve for x
    x = 115,097.45/378.02
  6. Step 6: Final answer
    x = 304.47

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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.