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Finding the Fourth Proportional to 265.30, 397.90 and 72.88

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Solution

The fourth proportional to 265.30, 397.90 and 72.88 is: 109.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.30 : 397.90 = 72.88 : x
  2. Step 2: Convert to fraction form
    265.30/397.90 = 72.88/x
  3. Step 3: Cross multiply
    265.30x = 397.90 × 72.88
  4. Step 4: Simplify right side
    265.30x = 28,996.60
  5. Step 5: Solve for x
    x = 28,996.60/265.30
  6. Step 6: Final answer
    x = 109.30

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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.