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Finding the Fourth Proportional to 315.69, 473.21 and 219.30

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Solution

The fourth proportional to 315.69, 473.21 and 219.30 is: 328.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.69 : 473.21 = 219.30 : x
  2. Step 2: Convert to fraction form
    315.69/473.21 = 219.30/x
  3. Step 3: Cross multiply
    315.69x = 473.21 × 219.30
  4. Step 4: Simplify right side
    315.69x = 103,774.95
  5. Step 5: Solve for x
    x = 103,774.95/315.69
  6. Step 6: Final answer
    x = 328.72

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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.