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Finding the Fourth Proportional to 265.61, 397.80 and 219.65

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Solution

The fourth proportional to 265.61, 397.80 and 219.65 is: 328.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.61 : 397.80 = 219.65 : x
  2. Step 2: Convert to fraction form
    265.61/397.80 = 219.65/x
  3. Step 3: Cross multiply
    265.61x = 397.80 × 219.65
  4. Step 4: Simplify right side
    265.61x = 87,374.78
  5. Step 5: Solve for x
    x = 87,374.78/265.61
  6. Step 6: Final answer
    x = 328.97

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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.